Recently bought an 2003 400ex with a 440 kit in it. Quad is very strong & runs great. But it smokes (white) on startup , then eventually just full throttle. After a little more time it fully goes away...is this valve seals?
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#1 HOKIE FAN
Recently bought an 2003 400ex with a 440 kit in it. Quad is very strong & runs great. But it smokes (white) on startup , then eventually just full throttle. After a little more time it fully goes away...is this valve seals?
BBBRRRAAAPPP
Valve seals would smoke on start up, then go away. Bad topend will smoke almost all the time and be grayish white. Black smoke is too rich.
If it's stupid, and it works, it isn't stupid. - Murphy's Law
2000 426EX,sold
2004 450R WIP
-Longtime A.A.D.S. (Accessory Acquisition Disorder Syndrome) sufferer.
400EX Frequently Asked Questions, CHECK HERE FIRST!
Registered User
sounds like its time for new piston and rings
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