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Hello! My 420 started smoking from muffler, white to gray smoke. Pulled plug and it's black and a bit wet. No oil in muffler. Oil and coolant levels remain the same. What could the issue be?maybe valve gasket? Any help very much appreciated.
 

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Welcome to the forum.... White smoke means that your burning water.... How long does it smoke??? All the time??? Or just on start up....Also what year is your bike???
 

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Discussion Starter #3
2013, doesn't smoke at all on start up. Only after its warm. Then it only smokes with acceleration.
 

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Ok.... You may have a water pump that's leaking water/ coolant into your engine causing the smoke...
No I doubt that its a bad gas problem... take your gas cap off and smell it...
 

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It doesn't have to be a large amount to make a little smoke.....
 

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Hello! My 420 started smoking from muffler, white to gray smoke. Pulled plug and it's black and a bit wet. No oil in muffler. Oil and coolant levels remain the same. What could the issue be?maybe valve gasket? Any help very much appreciated.
A wet and black spark plug generally indicates oil fouling. I'd check the compression on it following the procedure in the service manual... AFTER adjusting the valves.

If it was coolant washing the chamber down, the spark plug would begin to wash clean and develop a bronze colored tint on the center insulator.

Has this motor been submerged before?
 

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Yes, partially. It is snorkeled but the clamp where the heat shield meets the muffler came loose and had some play. Thinking maybe water got in that way. How should I adjust the valves?
 

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There are some stickies you can read HERE... you'll find valve adjustment near the top I think. The service manual tells all about that too. I'd read and familiarize yourself with both if I were you. Its not very difficult to do once you understand it.

If you got water in the motor being sunk you might be rebuilding it someday soon though. Did it ingest water and stop the motor when it happened?
 
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