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Compress check readings

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What is the reccomended compression readings for a yz250 . Mine is reading 150 psi it has 40hrs of racing on the hour meter.

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What year?

That's really low for the newer ones. 220+ psi is healthy for them.

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09 I forgot to hold the throttle wide open maybe that is the reason the reading is low

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09 I forgot to hold the throttle wide open maybe that is the reason the reading is low

 

Definitely. Repeat with throttle WOT. I did this to prove a point before, compression was 120 psi at idle, 195 psi when held WOT.

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