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05-30-2008, 06:46 PM #1
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What is the piston clearance on a 785?
Anyone have a manual handy? Need to know what the stock specs are on piston clearances for the 785. Installing ProX's
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05-30-2008, 06:49 PM #2
std: .003-.005" 0.075-0.13mm
limit is .008" .20mm
This is what I have listed in my 97 785 bookLast edited by 800AMSOIL4U; 05-30-2008 at 06:52 PM.
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05-30-2008, 06:51 PM #3
PROX should be .005, no tighter. Do not even think of going .003
SQUEEEAAAAKKKKKK
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05-30-2008, 08:19 PM #4
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If piping it set it up at .006" and make sure you measure from the skirts.
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05-31-2008, 10:21 AM #5
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From my measurements, the piston has about .00475 clearance built in. I didn't have a manual and wasn't going to assume that was it. Thanks for the info guys.
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05-31-2008, 02:02 PM #6
There is no "built in" clearance.
You take the size of the piston & make the bore .0055 bigger than the size of the piston.
I set my ProX up at .0055.
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