By combining various clutch sprockets and primary gears, the engine’s transimission can easily be modified. This is possible thanks to a universal cog of the primary gears. That way, 20, 21 and 22 teeth clutches can be used together with the 68 teeth primary gear wheel which is very common for all models up to 125 cc. Generally, you can say that nearly all clutches can be used with the 68 teeth primary, with the exception of the 23 teeth sprocket of the 200cc models. Namely, the latter may only be used with 65 teeth primaries. In order to swap the sprocket, you need to demount the clutch. Then, just replace the sprocket and put the clutch back on. We recommend the BGM Pro Street gear oil (BGM 2025, corresponds to specification API GL-3).
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