I am listing down some basic differences & similarities between 4-speed & 5-spee d RX135 (Includes RXG & RX-Z), which will help people to differentiate & learn m ore about these legendary series once produced in India. 1. Bore Kit (a.k.a Piston-Cylinder Kit / Barrel / Block) 4-Speed - '4TL00' with OEM "ART" STD piston '4Y201', Rating: 12BHP @ 6500RPM 5-Speed - '4TL10' with OEM "ART" STD piston '4Y201', Rating: 14BHP @ 7500RPM Note1: To check the originality, the LH side of Cylinder (Gear shifter side) has 4TL00 or 4TL10 marking along with 132cm3 (which is the displacement) and the RH sid (Crank Kicker Side) has the batch of manufacturing, for ex., E1, E2, E3 or E4 (A ll of them have exactly similar performance, people who swear by performance of E1 being the best, is all crap.) Also if nothing is mentioned or some other type code is mentioned, then the Cylinder is a fake, except for '4Y201' which is the original block of RX-K. Note2: The Cylinder packing has the following description on it: 1. RX135 4-Speed / RXG / RX-Z 4-Speed: "Cylinder Kit RXG" 2. RX135 5-Speed / RX-Z 5-Speed: "Cylinder Kit 5-Speed" Note3: Displacement calculation For Std RX135 being a single cylinder engine, we have the following inputs, Bore Dia = 58mm Bore Radius = 58/2 = 29mm Bore Radius Squared = 841mm2 Stroke Length = 50mm Pi = 22/7 = 3.142857 (Corrected upto 6 decimals) Number of Cylinders = 1 Displacement in mm3 = Stroke x Bore Radius Squared x Pi x No. of Cylinder = 50 x 841 x 3.142857 x 1 = 132157.143 Displacement in cm3 = 132157.143/1000 = 132.157 (Corrected upto 3 decimals)
2. Piston Kit The OEM Piston kit for Indian RX135 series are from "ART" Japan. For Indian mode ls piston sizes from STD to 0.5mm are available (in steps of 0.25mm). On careful observation of the piston, one can identify if it is original or not. Simply tu rn the piston upside down & inside we can see "ART" & "4Y201" clearly written. T his is the proof for original piston. The piston kit essentially comprises of · · · ·
Piston (STD/0.25mm/0.5mm) Piston Rings Piston Pin Clips
Note: The pistons are the same for RX135 4-Speed, RX135 5-Speed, RXG, RX-Z.
3. Carburettor Assembly The OEM Carb assembly for RX135 is Mikuni / UCAL Mikuni. The Carb assembly are d ifferent for both 4-Speed & 5-Speed versions. 4-Speed: '4TL 01' with Main Jet = 165 & Pilot Jet = 17.5 5-Speed: '4TL4 20' with Main Jet = 135 & Pilot Jet = 15.0 These are VM type of Carburettors manufactured by Mikuni & both are 22mm. Addito nally VM24 & VM26 are used for RX available in South-East Asian countries (Like Singapore, Indonesia & Malaysia) and in South American Countries (Like Peru, Arg entina & Brazil). The details of these are given below: VM24: '2YA 00' with Main Jet = 145 & Pilot Jet = 20.0 VM26: '55K 00D' with Main Jet = 210 & Pilot Jet = 22.5 These carbs (VM24 & VM26) are direct fit to Indian RX135s with some minor jettin g changes required based on the Power output of the engine. Note: The type code is mentioned just above the 2-T oil Inlet in the carb, with that the originality can be confirmed.
4. Head Assembly The heads are also different for 4-speed & 5-speed. The type code is mentioned b elow: RX135 4-Speed: '4TL5' written on inner side (Top) of Head (For OE fitting Cataly tic Converter type) RX135 4-Speed / RXG: '4TL00' written on inner side (Top) of Head (For OE fitting Chrome Silencer) RX135 5-Speed: '09L' written on inner side of Head
5. Clutch Bell Assembly with Primary drive The clutch bell assembly are the same for 4-speed & 5-speed RX135 (Including the number of Clutch plates), but it is different for RX-G. Below are the differenc es mentioned: RX135/RX-Z 4-Speed/5-Speed: Main Bell = 74 Teeth Primary Drive = 19 Teeth RX-G : Main Bell = 71 Teeth Primary Drive = 22 Teeth
6. Chain Sproket The sproket (Front & Rear) are all different for entire RX series. Detailed info given below:
4-Speed: 16T / 34T 5-Speed: 15T / 38T RX-G : 15T / 37T
7. Gear Box The Gearbox are obviously different for 4-speed & 5-speed. Details below: 4-Speed: 1st = 35/11 2nd = 30/15 3rd = 26/19 4th = 23/23
= = = =
3.182 2.000 1.368 1.000
5-Speed: 1st = 35/11 = 3.182 2nd = 30/15 = 2.000 3rd = 26/19 = 1.368 4th= 24/22 = 1.091 5th = 22/24 = 0.917
8. Engine The engine may be classifed based on Top End (Included Cylinder+Piston & Head) a nd Bottom End (Includes Clutch Assembly, CrankShaft, Engine Bearings, Crank Kick er, Engine Cases, Clutch/GB Covers, Ignition coil, GearBox Assembly etc as major components). Most of these items are already covered in points 1 to 7 above. Note1: The RX135 4-Speed & RX-Z 4-Speed share the same Engine, likewise RX135 5Speed & RX-Z 5-Speed share the same Engine. Note2: The CrankShaft Assembly is the same for RX135, RX-G, RX135 5-Speed & RX-Z . Note3: We can identify looking at the Engine number if the Bike was a 4-Speed ve rsion or a 5-Speed verion. Check the details below: 1. 2. 3. 4. 5.
RX135 (With Chrome Silencer as OE fitting): 1L5 XXXXXX RX135 (With Catalytic Silencer as OE fitting): 4TL XXXXXX RX135 5-Speed: 1L7 XXXXXX RX-Z 4-Speed: 1L3 XXXXXX RX100: 1L1 XXXXXX
P.S: The RX135 5-Speed never came with OE fitted Chrome silencer, the OE fit was the Big Hot-Tube type catalytic converter Exhaust.
