Sophomore Rider
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Joined: Mar 13, 2013 19:46:35 GMT -5
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Post by pgs on Jul 10, 2013 13:41:46 GMT -5
does the size of the wrist pin 10mm or 12mm determine how many rpms the stock crank can handle or is it just a difference in wrist pin size and nothing else
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Post by teddy554 on Jul 10, 2013 19:49:16 GMT -5
no a 10 can rev has high has a 12 . the 12 was originally for the 90cc motor i believe, but the quality of the crank is the big factor in what rpms a crank can take
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Post by alleyoop on Jul 10, 2013 20:10:34 GMT -5
Wrist pins all it does is fit the crank arm and the piston hole size. If there is play with the wrist pin it will clink clink clink sounds like marbles as it idles down from a rev which is not good.
Alleyoop
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..BAD TO THE BONE..