TRExp

TR5 & TR250 Forum

Piston to bore clearances

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oregon250 Chris P
Salem, Oregon, USA   USA
Machine shop is saying my piston to bore clearance is .0025 at the out of the wear zone and .0045 in the wear zone. Anyone know what the clearance spec is for the piston to bore? Have to decide weather to bore .020 over. Before the disassembly, if my memory serves me right I was running about 150 lbs compression in each cylinder and I'd go1200-1500 miles before adding a qt.

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Perdido Gold Member Rut Rutledge
Tuscaloosa, Alabama, USA   USA
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