135psi Right And 140psi Left

[dittmer]

I did a compression test today and the right side was at 135 and the

left was at 140. is this difference a big deal? also i did the test when the shee was cold would there be a diffrence if it was warmed up first?

[bignasty1]

when was your last rebuild my cylinders differed 4 lbs when i first had them rebuild and now they are dead on the same since i got a lil time on the motor.

[dittmer]

i have never rebuit the motor

[bignasty1]

whats ur elevation and did you have the head milled? those are high numbers for a stock bike usually its about 125 lbs for a stock headed shee.

[dittmer]

im about 750' with a new noss head 21cc domes i did the test after a short ride and it was 150psi on both so i dont think i need to worry

 

thanks for the help

[bignasty1]

did you test it warm or cold?

[dittmer]

when it was 150 on both it was warmed up but when it was 135/140 it was cold

[.]

How old is your top end? Those are good numbers for your elevation and 21cc domes. Keep doing what your doing......your top end seems to like it.

[fixitrod]

Compression wise you are fine. You can kick a little harder on one and get different numbers. Checking the compression doesn't tell you the condition of your piston skirts though. If you've never changed your rings, and your compression numbers are that good, your skirts probably aren't worn either. I'd leave it alone. Sounds to be strong.