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2001 yz125

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Doing some maintenance for a buddy can find how much compression he should have in his manual anywhere it had 150ish when I checked anyone know for sure

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Ok so this bike is low.... Not holding throttle open that would let compassion out no??? Give me a shittier reading. Also anyone know about the "A"B"or C stamp on cylinder base regarding which piston to order buddy who's bike it is says the local dealer always asks him but I'm getting parts online and can't find a choice for that?? Thanks for the help fellas grip and rip

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Unless it is the first piston that you are running through that cylinder, it is pretty much useless. The "C" piston is always a safe bet on a used cylinder. Not all piston brands offer different size pistons. They are sort of "one size fits all" with most brands.

 

Edit: and yes your reading will be thrown off without the throttle held open.

Edited by BDubb106

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It's been rebuilt a couple times C being the best choice for used cylinder..... Your saying hold the throttle open while doing compression test??

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It's been rebuilt a couple times C being the best choice for used cylinder..... Your saying hold the throttle open while doing compression test??

yes. Hold the throttle wide open!

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