[compression test ned help asap] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

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compression test ned help asap
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Posted by: 86250rbanshee

Just got a lt400 in the shop to work on won't start what shoud the compression be at i'm only getting aroun 60-80 after a couple cranks. I'm thinking not even close to being enough.

Posted by: drzoo2

142psi

http://home.stny.rr.com/wscomputers/ATV/compress.jpg

Posted by: Defiant1585

hey while were on the subject of specs what is the valve clearences suposed to be 10-20 on intake and 20 - 30 exaust?

Posted by: drzoo2

http://home.stny.rr.com/wscomputers/Post/valve.jpg

Posted by: 86250rbanshee

Anyone got any suggestions, took it all apart timing its dead on cams look good, piston looks good although fairly dark on top not bad, and cylinder looked good anyone got any idea why this stupid thing has little compression and won't start.

Posted by: Defiant1585

bad head gasket bad rings probably