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Discussion Starter · #1 ·
im thinking in install a 686cc 11:1 wiseco piston in my raptor 2005 but a mecanic told me that my stock crankshaft and the clutch wouldnt make it, im just wondering is there anyone that has that piston with stock crankshaft that could give me an advise
 

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been running a 12:1 102mm on stock crank for about 2 years now. Had to replace the oneway bearing due to compression but thats it. As a side note I am at higher elevation so static compression is lower.
 

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Your mechanic is either:

A. Trying to sell you more parts or just seal up some more work for himself installing the new parts.
B. Ignorant of the situation
C. Exaggerating based on limited experience, heresay, or he has problems with them because he does a poor job installing the piston.
 
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