2016 yz250 power valve

mcc
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mcc
Edited Date/Time 11/4/2019 12:45pm
Have a friend that bought a 2016 yz250 and after about 6-8 hours looks like the piston snagged the power valve. Anyone have this issue at all or known if this is a common issue with this year model?


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kb228
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kb228 11/4/2019 9:40am
11/4/2019 9:40am
Wouldnt say its common. The yzs are pretty solid bikes and have been for a long time. Almost seems like the piston/cyl clearance was too much and caused the piston to rock and snag the corner - just my guess
Paw Paw 271
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Paw Paw 271 11/4/2019 12:44pm
11/4/2019 12:44pm
The top of the piston shows pre-ignition pit marks. This will cause the piston to deform and can cause engine failure.
The squish needs to be checked and corrected prior to a rebuild. Also check power valve clearance.

Paw Paw

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