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crila18

07yz450 smoking.

6 posts in this topic

I got a yz 450 that whenever is cold it smokes a lot " bluish smoke" once it gets hot I does not smoke any more. Can someone help me find out what's wrong with my bike .thanks in advance

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Blue smoke means it's burning oil. Likely culprits are the piston rings or something in the valvetrain allowing oil to enter the cylinder like guides or worn seals. A leak down test would tell you more if you can do one.

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Oil smoke on start up only (clears out when warmed up, doesn't smoke under a load) is normally an indication of a valve guide seal(s) leaking.

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