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Micro Engine Repair Manual
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BRIGGS & STRATTON SMALL ENGINE CARE & REPAIR BOOK PART #274041 For the novice – a step-by-step guide to small engine care and repair. The full color book is 128 pages and includes over 300 color photos and easy-to-follow instructions. Concepts are introduced that apply to virtually every small engine making this appealing to a very broad audience. It offers consumers a step-by-step guide for saving money through preventive maintenance and do-it-yourself repair. Includes a troubleshooting section to easily diagnose common small engine problems. Features introductory projects that require no prior knowledge, as well as advanced projects for the experienced repair person. It utilizes the Briggs & Stratton name which is recognized worldwide as the small engine leader.
BRIGGS & STRATTON SMALL ENGINES TEXT BOOK PART #CE8020 A comprehensive hard cover textbook titled Small Engines was recently published by American Technical Publication of Homewood, Illinois. The text was authored by R. Bruce Radcliff, Former Customer Education Director for Briggs & Stratton. This entirely new book is authorized by Briggs & Stratton, the world’s largest manufacturer of small air cooled engines. In addition to covering all aspects of small engine theory, the subjects of shop safety, tools, troubleshooting and engine emissions are featured. The book contains 12 chapters covering the basic principles of small engine operation and service through engine theory to electricity and failure analysis. The book goes far beyond the procedures in the repair manual to present the “Why” in engine design features and operation fundamentals. Included are current high priority topics such as engine oil, reformulated fuels, engine emissions as well as the latest information on engine application. Fully illustrated, using computer generated line art and photographs, each topic is covered in easy to understand terms and four color illustrations. This should be a standard reference book for all small engine repair facilities, vocational schools and consumers. Small Engines is available through any Briggs & Stratton source of supply.
TABLE OF CONTENTS
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 1
DISASSEMBLY AND REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 2
COMPONENT LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 3
I
English to Metric Conversion Table Fraction 1/64
Decimal 0.0156
mm 0.3969
1/32 3/64
0.0312 0.0469
1/16
II
0.7938 1.1906
Fraction 33/64 17/32 35/64
Decimal 0.5156 0.5312 05469
mm 13.0969 13.4938 13.8906
0.0625
1.5875
9/16
0.5625
14.2875
5/64 3/32 7/64
0.0781 0.0938 0.1094
1.9844 2.3812 2.7781
37/64 19/32 39/64
0.5781 0.5938 0.6094
14.6844 15.0812 15.4781
1/8
0.1250
3.1750
5/8
0.6250
15.8750
9/64 5/32 11/64
0.1406 0.1562 0.1719
3.5719 3.9688 4.3656
41/64 21/32 43/64
0.6406 0.6562 0.6719
16.2719 16.6688 17.0656
3/16
0.1875
4.7625
11/16
0.6875
17.4625
13/64 7/32 15/64
0.2031 0.2188 0.2344
5.1594 5.5562 5.9531
45/64 23/32 47/64
0.7031 0.7188 0.7344
17.8594 18.2562 18.6531
1/4
0.2500
6.3500
3/4
0.7500
19.0500
17/64 9/32 19/64
0.2656 0.2812 0.2969
6.7469 7.1438 7.5406
49/64 25/32 51/64
0.7656 0.7812 0.7969
19.4469 19.8438 20.2406
5/16
0.3125
7.9375
13/16
0.8125
20.6375
21/64 11/32 23/64
0.3281 0.3438 0.3594
8.3344 8.7312 9.1281
53/64 27/32 55/64
0.8281 0.8438 0.8594
21.0344 21.4312 21.8281
3/8
0.3750
9.5250
7/8
0.8750
22.2250
25/64 13/32 27/64
0.3906 0.4062 0.4219
9.9219 10.3188 10.7156
57/64 29/32 59/64
0.8906 0.9062 0.9219
22.6219 23.0188 23.4156
7/16
0.4375
11.1125
15/16
0.9375
23.8125
29/64 15/32 31/64
0.4531 0.4688 0.4844
11.5094 11.9062 12.3031
61/64 31/32 63/64
0.9531 0.9688 0.9844
24.2094 24.6062 25.0031
1/2
0.5000
12.7000
1
1.0000
25.4000
Drill Size – Decimal Equivalent In Inches 60
.040
39
.0995
20
.161
1
.228
Q
.332
59
.041
38
.1015
19
.166
A
.234
R
.339
58
.042
37
.104
18
.1695
15/64 .2344
11/32 .3438
57
.043
36
.1065
11/64 .1719
B
.238
S
.348
56
.0465
7/64
.1094
17
.173
C
.242
T
.358
55
.052
35
.110
16
.177
D
.246
23/64 .3594
54
.055
34
.111
15
.180
E, 1/4 .250
U
.368
53
.0595
33
.113
14
.182
F
.257
3/8
.375
1/16
.0625
32
.116
13
.185
G
.261
V
.377
52
.0635
31
.120
3/16
.1875
17/64 .2656
W
.386
51
.067
1/8
.125
12
.189
H
.266
25/64 .3906
50
.070 30
.1285
11
.191
I
.272
X
.397
49
.073
48
.076
29
.136
10
.1935
J
.277
Y
.404
5/64
.0781
28
.1405
9
.196
K
.281
13/32 .4062
47
.0785
9/64
.1406
8
.199
9/32
.2812
Z
46
.081
27
.144
7
.201
L
.290
27/64 .4219
45
.082
26
.147
13/64 .2031
M
.295
7/16
44
.086
25
.1495
6
.204
19/64 .2969
29/64 .4531
43
.089
24
.152
5
.2055
N
.302
15/32 .4688
42
.0935
23
.154
4
.209
5/16
.3125
31/64 .4844
3/32
.0938
5/32
.1562
3
.213
O
.316
1/2
41
.096
22
.157
7/32
.2188
P
.323
40
.098
21
.159
2
.221
21/64 .3281
.413
.4375
.500
III
1
SECTION 1 General Information SECTION INDEX PAGE Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Check-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7 Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Carburetion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Engine Operation Equipment Affecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hard Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Kick-Back . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Will not Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 7 7 7 7 7 3
Maintenance Air Cleaner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil, Lubrication Check Oil Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Change Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oil Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 3 4 4 4
Oil Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Engine Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Tune-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1
1
In the Interest of Safety This safety alert symbol indicates that this message involves personal safety. The words “danger”, “warning” and “caution” indicate degree of hazard. Death, personal injury and/or property damage may occur unless instructions are followed carefully.
You are not ready to operate this engine if you have not read and understood the following safety items. Read the entire owner’s manual and the operating instructions of the equipment this engine powers.
The Briggs & Stratton engine is made of the finest material in a state-of-the-art manufacturing facility. Please understand that Briggs & Stratton sells engines to original equipment manufacturers. It also sells to others in the distribution chain who may sell to the ultimate consumer, an equipment manufacturer, another distributor or a dealer. As a result, Briggs & Stratton does not necessarily know the application on which the engine will be placed. For that reason, carefully read and understand the operating instructions of the equipment before you repair or operate it. You should also understand that there are equipment applications for which Briggs & Stratton does not approve the use of its engines. Briggs & Stratton engines are not to be used on vehicles with less than 4 wheels. They include motor bikes, aircraft products and All Terrain Vehicles. Moreover, Briggs & Stratton does not approve of its engines being used in competitive events. FOR THAT REASON, BRIGGS & STRATTON ENGINES ARE NOT AUTHORIZED FOR ANY OF THESE APPLICATIONS. Failure to follow this warning could result in death, serious injury (including paralysis) or property damage.
DO NOT run engine in an enclosed area. (Exhaust gases contain carbon monoxide, an odorless and deadly poison.) DO NOT remove fuel tank cap nor fill fuel tank while engine is hot or running. (Allow engine to cool 2 minutes before refueling.) DO NOT place hands or feet near moving or rotating parts. DO NOT store, spill, or use gasoline near an open flame, nor near an appliance like a stove, furnace, or water heater that uses a pilot light or can create a spark. DO NOT refuel indoors or in an unventilated area. DO NOT operate or tip engine/equipment at such a severe angle that causes gasoline spillage. DO NOT operate engine if gasoline is spilled or when smell of gasoline is present or other explosive conditions exist. (Move equipment away from spill and avoid any ignition until gasoline has evaporated.) DO NOT transport engine with fuel in tank or fuel shutoff valve open. DO NOT choke carburetor to stop engine, especially in an enclosed vehicle. (Whenever possible, gradually reduce engine speed before stopping.) DO NOT tamper with governor springs, links or other parts to increase engine speed. (Run engine at speed set for equipment manufacturer.) DO NOT check for spark with spark plug removed. (Use an approved tester.)
DO NOT run engine without blower housing or other safety shields removed when doing repairs. DO NOT crank engine with spark plug removed. (If engine is flooded, place throttle in FAST and crank until engine starts.) DO NOT strike flywheel with a hammer or hard object as this may cause flywheel to shatter in operation. (To remove flywheel, use Briggs & Stratton approved tools and procedures only.) DO NOT operate engine without a muffler. (Inspect periodically and replace if worn or leaking. If engine is equipped with muffler deflector, inspect periodically and replace if necessary. Replacement parts must be same as on original equipment.) DO NOT operate engine with an accumulation of grass, leaves or other combustible material in muffler area. DO NOT use this engine on any forest covered, brush covered, or grass covered unimproved land unless a spark arrester is installed on muffler. The spark arrester must be maintained in working order by the owner and/or operator. In the State of California the above is required by law (Section 4442 of the California Public Resources Code). Other states may have similar laws. Federal laws apply on federal lands. DO NOT touch hot muffler, cylinder, or fins which can cause burns. DO NOT start engine with air cleaner or air cleaner cover removed.
4Prior to work, read and understand the section(s) of this manual that pertain to the job. Follow all safety warnings. 4PULL starter cord slowly until resistance is felt. Then pull cord rapidly to avoid kickback and prevent hand or arm injury. 4WEAR suitable eye protection (safety glasses, goggles or face shield) when performing repair procedures. 4 PREVENT ACCIDENTAL STARTING by removing spark plug wire from spark plug when servicing engine or equipment. Disconnect negative wire from battery terminal if equipped with electric starting system. 4 REMOVE blower housing periodically and clean engine. Keep cylinder fins and governor parts free of dirt, grass and other debris which can affect engine speed. 4 USE fresh gasoline. Stale fuel can gum carburetor and cause leakage. 4 CHECK fuel lines and fittings frequently for cracks or leaks. Replace if necessary.
2
4 USE ONLY Genuine Briggs & Stratton Parts or their equivalent. The use of replacement parts which are not of equivalent quality may damage the engine.
WARNING:
The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
1
Fuel and Oil Recommendations LUBRICATION FUEL RECOMMENDATIONS
Gasoline
Engine Oil SAE VISCOSITY GRADES
These engines are certified to operate on unleaded gasoline. Use clean, fresh, regular unleaded gasoline with a minimum of 85 octane. Do not mix oil with gasoline. Fresh fuel prevents gum from forming in fuel system or on essential carburetor parts. Purchase fuel in quantity that can be used within 30 days to assure fuel freshness. We recommend the use of Briggs & Stratton Gasoline Additive. (See your Authorized Briggs & Stratton Service Dealer for Part No. 5041 or the single-use pouch.) In countries other than U.S.A., leaded gasoline may be used if it is commercially available and unleaded is unavailable. NOTE: Some fuels, called oxygenated or reformulated gasolines, are gasoline blended with alcohols or ethers. Excessive amounts of these blends can damage the fuel system or cause performance problems. Do not use gasoline containing Methanol. If any undesirable operating symptoms occur, use gasoline with a lower percentage of alcohol or ether.
**
°F °C
-20 -30
20
0 -20
-10
32
40
0
60 10
80 20
100 30
40
STARTING TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE
*
**
Air cooled engines run hotter than automotive engines. Use of non-synthetic multi-viscosity oils (10W-30, etc.) in ambient temperatures above 40° F (4° C) will result in high oil consumption. If multi-viscosity oil is used, check oil level more frequently to prevent engine damage due to lack of lubrication. SAE 30 oil, if used below 40° F (4° C), will result in hard starting and possible engine damage due to inadequate lubrication. Note: Synthetic oil meeting ILSAC GF-2, API certification mark and API service symbol (shown at left) with “SJ/ CF ENERGY CONSERVING” or higher, is an acceptable oil at all temperatures. Use of synthetic oil does not alter required oil change intervals.
CHANGE OIL after first 5 hours of operation. Thereafter, change oil monthly or every 50 hours of operation. Change oil more often if engine is operated under heavy load or in high ambient air temperatures. During normal operation, partially burned gasoline, small particles of metal from the cylinder walls, pistons, bearings, combustion deposits, and dust particles from the air will gradually contaminate the oil. If oil is not changed regularly, these foreign particles can cause increased friction and a grinding action which shortens the life of the engine. Fresh oil also assists in cooling. Old oil gradually becomes thick and loses its cooling ability as well as its lubricating qualities.
Check Oil Level Place the warm engine with the dipstick facing up.
Use a support (2), Fig. 1, to level the engine. NOTE: The engine MUST be level to obtain an accurate oil level measurement. Unscrew the dipstick (1), Fig. 1, and wipe it with a rag. Replace the dipstick, thread the dipstick in completely. Unscrew the dipstick to check the oil.
Fig. 1
3
1
BE SURE OIL LEVEL IS PROPERLY MAINTAINED. Always fill to dipstick FULL mark (2), Fig. 2.
Fig. 2
Change Crankcase Oil Remove dipstick, Fig. 1. Invert the engine to drain oil while the engine is warm. Fill engine with 2.7 oz. (80 ml.) of new oil. Replace dipstick.
Cooling System Grass particles, chaff or dirt can clog the air cooling system. Continued operation with a clogged cooling system can cause severe overheating and possible engine damage. This should be a regular maintenance operation, performed yearly. Clean more often if necessary.
Air Cleaner
A properly serviced air cleaner protects internal parts of the engine from dust particles in the air. If air cleaner maintenance instructions are not carefully followed, dirt and dust that should be collected in the air cleaner foam element will be drawn into the engine. Remove the air cleaner cover (2) and examine the foam air cleaner element (1) whenever the engine is serviced Fig. 3. Wash the element if it is dirty. Replace the foam element if it shows signs of damage.
Fig. 3
Breather Check Valve With the air cleaner removed inspect the breather check valve (3), Fig. 4. Remove any obstructions from the check valve. The check valve should be flexible and remain closed as shown.
Fig. 4
4
1
Spark Plug Replace spark plugs if electrodes show signs of wear, or the porcelain is cracked. Set spark plug gap at .022 – .028 Inch (.56 – .71 mm) as shown, Fig. 5. Torque spark plugs to 20 Nm (180 in. lbs.). Briggs & Stratton recommends spark plug number 696876 for the Micro Engine. Fig. 5
Tune-Up Procedure Performing these steps will either assure that the engine is functioning properly or will point out necessary repairs.
Step No. 1.
Remove spark plug lead from spark plug.
2.
Remove air cleaner.
3.
Check oil level and drain. (Clean fuel tank and lines. Replace in-tank fuel filter.)
4.
Remove blower housing, inspect rope and rewind assembly.
5.
Clean cooling fins and entire engine.
6.
Check compression and do a cylinder leakdown test.
7.
Remove carburetor, disassemble and inspect for wear or damage. Wash in solvent, replace parts as necessary and assemble.
8.
Check armature, inspect all wires for breaks or damaged insulation. Be sure lead wires do not touch flywheel. Check stop switch and lead.
9.
Remove flywheel, check for oil seal leakage, both flywheel and PTO sides. Check flywheel key.
10.
Install flywheel. Time engine if necessary. Set air gap. Check for spark with #19368 tester.
11.
Remove spark plug. Remove cylinder head, check gasket and clean carbon. Inspect valves for proper seating.
12.
Replace cylinder head. Torque to specifications, set spark plug gap or replace plug if necessary.
13.
Replace oil and fuel, check muffler for restrictions or damage.
14.
Adjust remote control linkage and cable (if used), for correct operation.
15.
Service air cleaner and breather check valve. Check gaskets and element for damage.
16.
Run and adjust idle speed.
5
1
Check-Up Check Ignition
Most complaints concerning engine operation can be classified as one or a combination of the following: 1. Will not start 2. Hard starting 3. Kicks back when starting 4. Lack of power 5. Vibration 6. Erratic operation 7. Overheating 8. High oil consumption When the cause of malfunction is not readily apparent, perform a check of the compression, ignition and carburetion systems. This check-up, performed in a systematic manner, can usually be done in a matter of minutes. It is the quickest and surest method of determining the cause of failure and averting future problems. The basic check-up procedure is the same for all engine models, while any variation, by model, will be shown under the subject heading. NOTE: What appears to be an engine malfunction may be a fault of the powered equipment rather than the engine. If equipment is suspect, see “Equipment – Affecting Engine Operation.”
Check Compression WARNING: Before checking compression, remove spark plug wire from spark plug and ground to engine. A leakdown test is the only accurate method of checking the sealing ability of the combustion chamber. This test uses compressed air and a leakdown test tool. If compression is poor, look for: 1. Loose cylinder head bolts 2. Blown head gasket 3. Burned valves, valve seats 4. Insufficient tappet clearance 5. Warped cylinder head 6. Warped valve stems 7. Worn bore and/or rings 8. Broken connecting rod
6
WARNING: Do not remove spark plug when checking ignition. Connect spark plug wire to long terminal of tester, Tool #19368 and ground tester to engine with alligator clip. Operate starter and observe spark gap in tester. If spark jumps tester gap, you can assume ignition is good. Try a new spark plug. If spark does not occur, look for: 1. Improperly operating interlock system (when equipped) 2. Shorted ground wire (when equipped) 3. Shorted stop switch (when equipped) 4. Armature failure 5. Worn bearings and/or shaft on flywheel side only NOTE: If engine runs but misses during operation, a quick check to determine if ignition is at fault can be made by inserting the #19368 tester between the ignition cable and the spark plug. A spark miss will be readily apparent.
Check Carburetion Before making a carburetion check, be sure the fuel tank has an ample supply of fresh, clean gasoline. Inspect the mixture needles per specification. Check to see that the choke closes completely. If engine will not start, remove and inspect the spark plug. If plug is wet, look for: 1. Over choking 2. Excessively rich fuel mixture 3. Water in fuel If plug is dry, look for: 1. Leaking carburetor mounting gaskets 2. Inoperative pump. 3. Plugged fuel line or filter. A simple check to determine if the fuel is getting to the combustion chamber through the carburetor is to remove the spark plug and pour a small quantity of gasoline (1 teaspoon or 10 ml.) through the spark plug hole. Install spark plug. If the engine fires a few times and then quits, look for the same condition as for a dry plug.
1
Check-Up cont’d Equipment-Affecting Engine Operation Frequently, what appears to be a problem with engine operation, such as hard starting, vibration, etc., can be caused by the equipment being powered rather than the engine itself. Since many varied types of equipment are powered by Briggs & Stratton engines, it is not possible to list all of the various conditions that may exist. Listed are the most common effects of equipment problems, and what to look for as the most common cause.
Hard Starting, Kickback, or Will Not Start 1. Loose blade – blade must be tight to shaft or adaptor. Check for partially sheared flywheel key, or damaged blade and hub. 2. Starting under load – see if the unit is not engaged when engine is started; if the unit is engaged, that it does not have a heavy parasitic load. 3. Check choke or speed control assembly for proper adjustment. 4. Check interlock system for shorted wires, loose or corroded connections, or defective modules or switches.
Vibration 1. Cutter blade bent or out of balance – remove and balance. Check for partially sheared flywheel key. 2. Crankshaft bent – replace. 3. Worn blade coupling – replace if coupling allows blade to shift. 4. Mounting bolts loose – tighten.
Power Loss 1. Bind or drag in unit – if possible, disengage engine and operate unit manually to check for any binding action.
Engine Identification General Model Series numbers are stamped on the identification plate (1) located on the bottom of your engine. To get replacement parts or technical assistance note your engine Model, Type, and Code.
Fig. 6
7
1
YOUR KEY TO THE WORLD’S FINEST ENGINES This handy chart explains the unique Briggs & Stratton numerical model designation system. It is possible to determine most of the important mechanical features of the engine by merely knowing the model number. Here is how it works: A. The first one or two digits indicate the CUBIC INCH DISPLACEMENT. B. The first digit after the displacement indicates BASIC DESIGN SERIES, relating to cylinĆ der construction, ignition, general configuration, etc. C. The second digit after the displacement indicates POSITION OF CRANKSHAFT and TYPE OF CARBURETOR. D. The third digit after the displacement indicates TYPE OF BEARINGS and whether or not the engine is equipped with REDUCTION GEAR or AUXILIARY DRIVE. E. The last digit indicates the TYPE OF STARTER.
BRIGGS & STRATTON MODEL NUMBERING SYSTEM A
FIRST DIGIT AFTER DISPLACEMENT
SECOND DIGIT AFTER DISPLACEMENT
B
CUBIC INCH DISPLACEMENT
BASIC DESIGN SERIES
ă6 ă8 ă9 10 11 12 13 16 18 19 20 21 22 23 24 25 28 29 30 31 32 35 38 40 42 43 44 46 52 58
0 1 2 3 4 5 6 7 8 9 A to Z
EXAMPLE - To identify Model 303447: 30 3 30 Cubic Inch Design Series 3
8
THIRD DIGIT AFTER DISPLACEMENT
FOURTH DIGIT AFTER DISPLACEMENT
C
D
E
CRANKSHAFT, CARBURETOR, ă GOVERNORă
PTO BEARING, REDUCTION GEAR, AUXILIARY DRIVE, LUBRICATIONă
TYPE OF STARTER
0 - Horizontal Shaft Diaphragm Carburetor Pneumatic Governor 1 - Horizontal Shaft VacuĆJet Carburetor Pneumatic Governor 2 - Horizontal Shaft PulsaĆJet Carburetor Pneumatic or MechaniĆ cal Governor 3 - Horizontal Shaft FloĆJet Carburetor Pneumatic Governor 4 - Horizontal Shaft FloĆJet Carburetor Mechanical Governor 5 - Vertical Shaft VacuĆJet Carburetor Pneumatic or MechaniĆ cal Governor 6 - Vertical Shaft 7 - Vertical Shaft FloĆJet Carburetor Pneumatic or MechaniĆ cal Governor 8 - Vertical Shaft FloĆJet Carburetor Mechanical Governor 9 - Vertical Shaft PulsaĆJet Carburetor Pneumatic or MechaniĆ cal Governor A to G - Horizontal Shaft H to Z - Vertical Shaft 4 Horizontal Shaft FloĆJet Carburetor Mechanical Governor
0 - Plain Bearing/DU NonĆFlange Mount 1 - Plain Bearing Flange Mounting 2 - Sleeve Bearing Flange Mounting Splash Lube 3 - Ball Bearing Flange Mounting Splash Lube 4 - Ball Bearing Flange Mounting Pressure Lubrication on Horizontal Shaft 5 - Plain Bearing Gear Reduction (6 to 1) CW Rotation Flange Mounting 6 - Plain Bearing Gear Reduction (6 to 1) CCW Rotation 7 - Plain Bearing Pressure Lubrication on Vertical Shaft 8 - Plain Bearing Auxiliary Drive (PTO) Perpendicular to Crankshaft 9 - Plain Bearing Auxiliary Drive Parallel to Crankshaft
4 Ball Bearing Flange Mounting Pressure Lubrication on Horizontal Shaft
0 1 2 3
-
456789A-
Without Starter Rope Starter Rewind Starter Electric Starter Only 110 or 230 Volt Gear Drive Electric Starter/110 or 230 Volt Gear Drive with Alternator Electric Starter Only 12 or 24 Volt Gear Drive Alternator Only Electric Starter 12 or 24 Volt Gear Drive with Alternator Vertical Pull Starter or Side Pull Starter Mechanical Starter Electric Starter 12 or 24 Volt Gear Drive with Alternator and Inverter
7 Electric Starter 12 or 24 Volt Gear Drive with Alternator
SECTION 2 Disassembly and Repair SECTION INDEX PAGE Disassembly External Engine Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Short Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Assembly Short Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Valve Clearance – Check and Adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 External Engine Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Carburetor Repair Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Specifications Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Torque Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
NOTE: When removing screws from the engine, the screw threads will loosen aluminum particles which can get into the engine: Clean thoroughly whenever removing screws from the engine. Do not use impact tools to remove or install screws. Use lubricant liberally whenever removing screws.
NOTE: There is no provision to bore or hone the engine block. If the piston bore is worn or damaged, replace the engine.
1
Disassembly 2. Remove screws from the blower housing/rewind (1) and cylinder shield (2) covers. Remove covers, Fig. 1.
NOTE: Remove screws with the T-25 bit (6, Fig. 5) from Briggs & Stratton Tool #19442 Torqux Star Bit Set. 3. Disconnect the fuel lines (3) from the carburetor. NOTE: The fuel RETURN line is clear and goes on the plastic barbed fitting. The fuel SUPPLY line has a green dot near one end and goes on the brass fitting.
Fig. 1
4. Remove the dipstick (4). Drain the oil from the crankcase.
Rewind Starter CAUTION: WEAR SAFETY glasses while performing any rewind starter repair.
1. Pull starter rope out and hold. 2. Inspect starter rope. Replace the rope if any strands are frayed or broken.
Starter Rope 1. Pull end of rope from handle Fig. 2. Untie or cut off the knot at end of rope (1). While holding the pulley, slowly allow the rope to retract into the rewind, relieving return spring pressure. 2. If the starter rope was cut for removal, burn the cut end of the rope with an open flame. Using caution, wipe the end of the rope with a waste cloth while it is still hot, to prevent swelling and unravelling. NOTE: If replacing the starter rope, check the parts list to be sure the correct diameter and rope length is used. The service replacement rope is cut to length as required.
2
Fig. 2
3. Insert rope through handle (1). Tie knot as shown, Fig. 3. 4. If re-using old rope, burn pulley end of rope with a match. 5. Using caution, while rope is still hot, wipe with waste cloth to prevent swelling and unraveling. 6. Pull knot into cavity in handle.
ÎÎ ÎÎ Fig. 3
Wind Spring 1. Turn pulley clockwise (arrow) until spring is wound tight. 2. Rotate pulley counterclockwise until rope hole in pulley is in line with starter housing eyelet (1) and hold pulley, Fig. 4.
Install Rope to Starter 1. Insert unknotted end of rope through starter housing eyelet and rope hole in pulley. 2. Tie a knot in the rope and pull tight. Pull knot into the cavity of the pulley 3. While holding starter rope handle, slowly let pulley pull starter rope into starter.
Fig. 4
3
External Engine Components 1. Remove the ignition armature (5), Fig. 5. NOTE: Remove screws with the T-25 bit (6, Fig. 5) from Briggs & Stratton Tool #19442 Torqux Star Bit Set.
Fig. 5
2. Install Briggs & Stratton Tool #19538 Flywheel Puller (9) with the concave side facing the flywheel and underneath the starter pawls (7) as shown, Fig. 6.
3. Insert the driver (8) to the flywheel nut as shown, Fig. 6. 4. Use Briggs & Stratton Tool #19433 Flywheel Strap Wrench to secure the flywheel. Turn the driver counterclockwise to remove the flywheel and flywheel nut from the crankshaft.
Fig. 6
4
5. Remove the top three muffler bolts (10), Fig. 7. Remove the muffler.
Fig. 7
6. Remove the air cleaner assembly. 7. Remove two nuts (11), Fig. 8. Slide carburetor from the studs.
11
Fig. 8
8. Remove seven cylinder head bolts (12), Fig. 9. Remove cylinder head. 12
12
12
12
12
12
12
Fig. 9
5
9. Remove two screws (13), Fig. 10. Remove the carburetor spacer. 13 13
Fig. 10
Short Block 1. Remove two screws. Remove valve cover (1) and gasket, Fig. 11.
Fig. 11
2. Turn the valve retainers so the release holes face out. Lift the front of the retainer (2) with a small screwdriver to release the retainer from the valve, Fig. 12.
Fig. 12
6
3. Remove the valves, springs and retainers. NOTE: The intake valve has a valve oil seal on top of the valve spring, Fig. 13. The exhaust valve has an exhaust spring centering cap on top of the valve spring.
Fig. 13
4. Remove the crankcase cover bolts (3), and crankcase cover (4) with gasket, Fig. 14.
Fig. 14
7
5. Rotate the crankshaft until the piston pin is aligned with the access hole in the cylinder. 6. Use a small screwdriver or similar tool in the recess of the piston (5) to remove the piston pin retaining clip, Fig. 15. Discard the used retaining clip.
CAUTION: Wear eye protection when removing piston pin retaining clip.
Fig. 15
7. Remove the piston pin by inserting a tool (6) into the hole of the piston pin. Use a twisting motion and pull the pin out of the piston, Fig. 16.
NOTE: Do not apply downward pressure on the piston pin. Use caution to avoid piston and bore damage.
Fig. 16
8. Rotate the crankshaft one revolution and position the crankshaft throw near bottom-dead-center (BDC), Fig. 17. This will leave the piston near the top of the bore. Lift the connecting rod (7) off of the crankpin, and remove the connecting rod.
Fig. 17
8
9. Push the piston (8) out of the cylinder (9), Fig. 18.
Fig. 18
10. Clean and inspect the cylinder. Measure the cylinder bore twice, at right angles, at the top (10), middle (11) and bottom (12) of the piston ring travel, Fig. 19. Standard cylinder bore dimension is 1.575 in. (40.0 mm). Discard the cylinder if the bore is 1.578 in. (40.08 mm) or over.
11 12 13
11. Remove the piston rings from the piston. Clean, inspect and measure the piston. Standard piston diameter is 1.573 in. (39.95 mm). Piston-to-cylinder clearance is .001 – .003 in. (.025 – .076 mm). 12. Clean all carbon from the ends of the old piston rings (16) and from the cylinder bore. Fig. 19
13. Insert rings one at a time .5 in. (13 mm) into the cylinder. 14. Check the ring end gap with a feeler gauge (14), Fig. 20. Ring end gap (15) dimensions are: Top Ring
.004 – .011 in. (.10 – .28 mm)
2nd
Ring
.004 – .011 in. (.10 – .28 mm)
Oil Ring
.008 – .027 in. (.20 – .69 mm)
If the piston ring end gap exceeds the largest dimension reject the piston ring.
14 16
ÇÇ ÇÇ ÇÇ
15
Fig. 20
9
15. Remove two screws (17) and the camshaft cover, Fig. 21.
17
Fig. 21
16. Position the engine so that gravity keeps the tappets off of the camshaft, Fig. 22. Remove the camshaft (18).
18
Fig. 22
10
17. Remove the tappets (19) from the engine, Fig. 23.
19
Fig. 23
18. Support the cylinder with Tool # 19123 Cylinder Support Jack. Use Tool #19179 Driver to remove the ball bearing from the crankcase. Inspect the ball bearing for wear, pitting or damage. 19. Press the crankshaft and bearing from the cylinder block, Fig. 24. Inspect the crankshaft, cam drive gear and ball bearing. Replace the crankshaft if any components are unserviceable. 20. Support the cylinder with Tool # 19123 Cylinder Support Jack. Use Tool #19450 Driver to press the ball bearing into the crankcase.
Fig. 24
11
Assembly Short Block 1. Clean all parts and gasket mating surfaces. Inspect all components for wear or damage, replacing as required. 2. Press the crankshaft into the cylinder block. 3. Lubricate the piston and cylinder. Compress the piston rings as shown, Fig. 25. 4. Slide the piston into the cylinder with the “1” and “C” marks (7) on the side toward the piston pin access hole. Leave the piston near the top of the cylinder.
Fig. 25
5. Lubricate the connecting rod bearings. 6. Position the crankshaft near BDC. 7. Install the connecting rod with the dimple (8) toward the crankpin, facing the cover side of the crankcase as shown, Fig. 26.
Fig. 26
12
8. Slide the piston down the cylinder bore and align the piston pin opening in the piston with the connecting rod bearing.
9. Lubricate and install the piston pin (9), Fig. 27.
Fig. 27
10. Install a new piston pin retaining clip. NOTE: DO NOT re-use the old clip. Always install a new piston pin retaining clip. 11. Install a new crankcase cover gasket. Install the crankcase cover. Torque screws to 60 in. lbs. (7 Nm). 12. Install the tappets (10), Fig. 28. 13. Position the engine so that gravity keeps the tappets in place.
Fig. 28
13
14. Position the piston at top-dead-center (TDC), Fig. 29.
Fig. 29
15. Position the engine as shown, using gravity to keep the tappets in position. Install the camshaft so the mark on the gear (12) is at the 12:00 o’clock position, between the lowest gear teeth of the crankshaft, Fig. 30. 16. Install the camshaft cover and gasket. Torque camshaft cover bolts to 50 in. lbs. (6 Nm). 12
Fig. 30
14
Valve Clearance – Check and Adjust 1. Install the valves without the springs or retainers. NOTE: The valve clearance must be checked whenever the camshaft cover has been removed.
2. Position the piston to 1/4 in. (6.35 mm) after TDC of the compression stroke. Both valves should be closed. If both valves are not closed, rotate the crankshaft 360 degrees (one revolution) into the same position. 3. Hold the valve closed with finger pressure. Use a feeler gauge (1) to check the clearance between the valve stem and tappet, Fig. 31. Clearance should be .002 – .004 in. (.05 – .10 mm). If the valve clearance is less than specification, grind the tip of the valve stem until proper clearance is obtained.
Fig. 31
NOTE: Use the correct fixture when grinding valve stems to be certain the valve stem is ground squarely. 4. Install new intake valve oil seal (2) to the intake valve spring, Fig. 32. 5. Install the valve spring centering cap to the exhaust valve spring. 6. Install valve springs and retainers. 7. Install the valve cover. Torque the valve cover screws to 60 in. lbs. (7 Nm).
Fig. 32
15
External Engine Components 1. Install new cylinder head gasket and cylinder head.
2. Torque head bolts in sequence shown, Fig. 33. Torque to 75 in. lbs. (8.5 Nm).
3. Install carburetor spacer to studs. Torque to 60 in. lbs. (7 Nm). 4. Install new crankcase cover gasket and crankcase cover. Torque the cover screws to 60 in. lbs. (7 Nm).
Fig. 33
5. Carefully install the flywheel. Make sure the “keyed” part of the flywheel casting (8) is engaged to the keyway in the crankshaft, Fig. 34. NOTE: The flywheel key is not serviceable, it is part of the flywheel casting.
6. Install special flywheel nut. Torque to 170 in. lbs. (19 Nm). 7. Install the muffler. Torque to 40 in. lbs. (5 Nm).
Fig. 34
8. Install ignition armature. Use a feeler gauge to adjust the air gap between the flywheel magnets and the armature legs to .010 – .014 in. (.25 – .35 mm), Fig. 35. Torque armature screws to 60 in. lbs. (7 Nm).
9. Fill engine with 2.7 oz. (80 ml.) of new oil. Install the dipstick. 10. Install the carburetor spacer, carburetor and air cleaner. 11. Connect the fuel lines to the carburetor. NOTE: The fuel RETURN line is clear and goes on the plastic barbed fitting. The fuel SUPPLY line has a green dot near the end and goes on the brass fitting.
16
Fig. 35
12. Replace the crankcase cover gasket. Install the crankcase cover and screws. Torque the screws to 60 in. lbs. (7 Nm) in the sequence shown, Fig. 36. 13. Install the blower housing and cylinder shield. Torque the screws to 40 in. lbs. (5 Nm).
Fig. 36
Carburetor Repair Disassembly
R
S
1. Remove the carburetor from the engine. 2. Remove four screws (1), the primer bulb (2), and the primer bulb cover (3), Fig. 37. NOTE: The fuel RETURN line is clear and goes on the plastic barbed fitting (R). The fuel SUPPLY line has a green dot near one end and goes on the inlet fitting (S).
Fig. 37
17
3. Remove the primer backplate (4) and the diaphragm (5), Fig. 38.
Fig. 38
4. Remove the fuel pump body (6) and diaphragm (7), Fig. 39.
Fig. 39
5. Remove the needle retaining screw (8), Fig. 40.
Fig. 40
18
6. Remove the needle (9), shaft (10), arm (12), and spring (11), Fig. 41.
11
12
Fig. 41
7. Remove the main jet (13) and O-ring from the carburetor body, Fig. 42. 13
Fig. 42
19
8. Mark the idle speed screw side of the carburetor for correct orientation during reassembly. 9. Remove two screws (15) and the throttle valve assembly (14), Fig. 43.
14
15
15
Fig. 43
10. Remove the throttle valve assembly (14) from the carburetor body (15), Fig. 44. Clean and inspect all parts for wear or damage. 11. Blow out all passages with compressed air. Replace parts as required. 14 15
Fig. 44
20
Assembly 1. Install the throttle valve assembly with the idle speed adjustment screw lined up with the mark made during disassembly, Fig. 43. 2. Lubricate the O-ring (1) on the main jet. Install the main jet to the carburetor body, Fig. 45.
Fig. 45
3. Install the spring (3), gasket (4) and diaphragm (2), Fig. 46.
Fig. 46
21
4. Install the needle (5), arm (7), shaft (6) and spring (8). Make sure the slot in the needle remains in the yoke in the arm, and the spring remains straight under the dimple in the arm, Fig. 47. 5. Install the shaft retaining screw.
Fig. 47
6. Replace the primer check valve (9), Fig. 48.
Fig. 48
7. Install the gasket (11) first, then install the diaphragm (10), Fig. 49.
11
Fig. 49
22
8. Install the primer bulb (12) to the back plate (13), Fig. 50. 12
13
Fig. 50
9. Install the primer bulb cover (12), back plate (13), and fuel pump body (14) assembly to the carburetor body (15), Fig. 51.
12
10. Slide the carburetor onto the mounting studs and secure with two nuts.
13
14
15
Fig. 51
23
SPECIFICATIONS Micro Engine Dimensions Cylinder Bore
1.575 in. (40.00 mm)
Stroke – 34cc Engine
1.066 in. (27.08 mm)
Stroke – 40cc Engine
1.25 in. (31.75 mm)
Piston Diameter
1.573 in. (39.95 mm)
Piston-to-Cylinder Clearance
.001 – .003 in. (.03 – .08 mm)
Piston Ring End Gap – Top Ring
.004 – .011 in. (.10 – .28 mm)
Piston Ring End Gap – Second Ring
.004 – .011 in. (.10 – .28 mm)
Piston Ring End Gap – Oil Control Rings
.008 – .027 in. (.20 – .69 mm)
Spark Plug Gap
.022 – .028 in. (.56 – .71 mm) Micro Engine Torque Specifications
24
Bolt Location
Quantity Used
Torque Inch Pounds
Torque Newton Meters
Blower Housing
2
40
5
Camshaft Cover
2
50
6
Carb Adapter
2
60
7
Carb Mount Stud
2
24
3
Cylinder Head
7
75
8
Flywheel Nut/ Crank Adapter
1
170
19
Ignition Coil
2
60
7
Muffler Housing
2
40
5
Muffler
3
60
7
Rear Housing
4
24
3
Spark Plug #696876
1
180
20
Sump Cover
9
60
7
Valve Box Cover
2
60
7
3
SECTION 3 Component Location SECTION INDEX PAGE Component Location Drawings Carburetor Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Crankshaft, Piston and Flywheel Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Camshaft and Crankshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1
3
Carburetor Components
1. 2. 3. 4. 5.
2
Gasket Carburetor Screw (SS, 2 used) Carburetor Spacer Carburetor Spacer Screw (2 used) Gasket
6. 7. 8. 9. 10.
Carburetor Nut (2 used) Air Cleaner Base Air Filter Air Cleaner Cover
3
Crankshaft, Piston and Flywheel Components
1. 2. 3. 4. 5.
Flywheel Crankshaft Connecting Rod Piston Oil Control Rings
6. 7. 8. 9. 10.
Second Compression Ring Top Compression Ring Piston Pin Retaining Clip Piston Pin Crankcase Cover
3
3
Camshaft, Crankshaft and Related Components
17
11
12
13 14
15 16
1. 2. 3. 4. 5. 6. 7. 8. 9.
4
Valve Cover Valve Cover Gasket Camshaft Exhaust Valve Spark Plug Cylinder Head Intake Valve Intake Valve Seal Valve Spring (2 used)
10. 11. 12. 13. 14. 15. 16. 17.
Spring Retainer (2 used) Tappet (2 used) Crankshaft Gasket Camshaft Cover Breather Hose Breather Exhaust Valve Centering Cap
PROFESSIONAL CD REPAIR MANUALS PART #CE3039 This set of six CDs offers the user an opportunity to maintain or repair a Briggs & Stratton engine with the click of the mouse on their computer. The CDs cover all Briggs & Stratton air cooled engines produced after 1981. The CDs allow you to view, print and troubleshoot. NOTE: System Information for all CDs
For a complete list of all tools, order Briggs & Stratton Service Tools Catalog, form number MS-8746.
S IBM PC or compatible S This program operates only on Microsoft Windows 95, NT, 98 Pentium, ME, XP"(or equal) 66 MHz processor or faster S 16MB RAM or more S 50MB of free hard drive space
S 8x (or faster) CD-ROM drive S Video display capable of min. 16 bit color @ 800x600 res. S 16-bit multimedia sound card S Briggs & Stratton interactive repair manuals will not run on 386 or earlier CPUs
ACKNOWLEDGEMENTS Customer Education: Director of Customer Education . . . . . . . . . . . Dann Roark Technical Writing Supervisor . . . . . . . . . . . . . Donald Koloski Technical Writing . . . . . . . . . . . . . . . . . . . . . . . Trenton Technical Studio, Inc. Briggs & Stratton Graphic Services: Graphic Services Manager . . . . . . . . . . . . . . . Pre-Press Supervisor . . . . . . . . . . . . . . . . . . . Desktop Publisher . . . . . . . . . . . . . . . . . . . . . . Graphic Designer . . . . . . . . . . . . . . . . . . . . . . .
Debbie Pavletich Barb Peterson Barb Peterson Chad Goratowski
Copyright 2002 by Briggs & Stratton Corporation All rights reserved. No part of this material may be reproduced or transmitted, in any form or by any means, electronic or mechanical, including photocopying, recording or by any information storage and retrieval system, without permission in writing from Briggs & Stratton Corporation.
Repair Manuals for other Briggs & Stratton Engines, order:
CE8069 – Out of Production Engines (From 1919-1981) 270962 – Single Cylinder “L” Head (Built after 1981) 271172 – Twin Cylinder “L” Head 272144 – Vanguard™ V-Twin OHV 272147 – Single Cylinder OHV 273521 – Intek™ V-Twin Cylinder OHV 275110 – Outboard MS-0729 – 3 Cylinder Liquid Cooled
®
Quality Starts With A Master Service Technician
BRIGGS & STRATTON CORPORATION Milwaukee, WI 53201 Part No. 275072-7/02 Printed in U.S.A. www.briggsandstratton.com
