How much clearance ?

Joined
Apr 20, 2003
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#1
At high revs the crank flexes slightly, and the rod is a little longer, throw in a bit of bigend wear, and the squish clearance reduces,
what is a safe number.
 

bclapham

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Nov 5, 2001
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#2
i go for around 0.7-1.0 mm on my 125 and 250 bikes. i had an odd sizedd gasket once and it was around 0.5mm and even with 110+octane fuel the deto fairy came for a visit!

for that bigger bike i would think 1.0-1.5mm is good, look at erics book maybe for specifics