Maintenance & Technical > KX100 / KX85 / KX80 / KX65 / KX60
yz85 oil question
chris-mets:
Thanks but I had already picked one up on ebay and the compression is on the high side! I fixed that issue with the oil and theres no more oil. Only problem now is the cutting out while giving gas. Im wondering if I go bigger or smaller main or clip, etc. Thanks
Chris
Sapper:
Well lurking though here, I have to jump in. I'd seen on page 3 a compression test was done and spec'd out at 120psi and no one caught it. That's way too low. 150 is about the time to change rings or topend. Good averages for a test is about 185-205. Did you hold throttle WOT while kicking?
Not that you're fighting a sputtering issue, move the clip up on the needle. If it gets better then it still does it even on the top position, you may need a different needle. It's not uncommon to replace the needle. Just most don't need it for a decent jetting tune on a stock or piped motor.
here's a little something funny with a 125 with 65psi compression.
http://www.youtube.com/watch?v=8e7n0lCDYxE
KevinTwoStk:
Old thread...new questions.
Is there a power valve on that YZ? If the power valve isn't working as it's supposed to, it could contribute to the poor performance you're experiencing.
What about the crank seals? If the clutch side crank seal is toast, you could get plug fouling and oily spooge in the exhaust even if your jetting is perfect. Side note:if the magneto side crank seal is similarly damaged, you'll get a lean condition instead.
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