I have several of the typical 49cc 2 stroke engines used for dirt bikes. They all have the same type of centrifugal clutch. Recently I have ordered a Honda GX-35 (4 stroke) engine and - what a surprise - it uses the same type of clutch. I am wondering, is there a standard for those clutches or why are they all compatible? Also are there clutches of the same format that engage quicker? For my Honda GX-35 I need to put like 25% throttle to engage the clutch at 4200 RPM, however I would like to have the clutch engage at like 2-3% throttle already. What do I have to look for to get something like this?