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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?

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  • $\begingroup$ Change the masses and springs: that changes the reaction time. But think about the consequences. $\endgroup$ – Solar Mike Sep 4 '20 at 19:58
  • $\begingroup$ Yea, obviously, but why can I unscrew a random clutch bell from a 2-stroke engine and put it on my honda GX-35 engine and it goes with 4200 RPM like you can read on the internet. There has to be some kind of (unwritten) standard, doesnt it? $\endgroup$ – Yanick Salzmann Sep 4 '20 at 20:19
  • $\begingroup$ Also maybe it is just my programmer me talking, but I cannot believe that people just use the same type of equipment just because it is convenient ;) $\endgroup$ – Yanick Salzmann Sep 4 '20 at 20:28
  • $\begingroup$ don’t they take chunks of code and re-use it? Just because it’s there. And, they do that even if it has a bug... $\endgroup$ – Solar Mike Sep 4 '20 at 20:46
  • $\begingroup$ You mean because it turns up on a stackoverflow search? No.... it never happens.... ever! $\endgroup$ – Yanick Salzmann Sep 4 '20 at 21:20

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