Question by  JonReid (21)

Could blue smoke be related to my heavy rich fuel mixture in my motorcycle?


Answer by  Amber40 (24961)

More often then not blue smoke is a sign of oil being burned. If the exhaust smells of gas then it may be rich also.


Answer by  Birder80 (181)

Yes it can be related to a rich fuel mixture. The main jet could be too large or might have vibrated off. It could also be that you air cleaner filter is clogged.


Answer by  HDgearjammer (30)

Over rich fuel mixture would be indicated by black/grey smoke coming from the exhaust. Blue smoke only means one thing, that oil is getting past the rings of the cylinders and burning out the exhaust. To verify this, a compression test should be made of each cylinder to make sure the pressure is within the limits that the manufacturer recommends.


Answer by  ScooterMike (145)

Typically black smoke indicates poor fuel mixture, where as blue smoke can indicate engine damage or excessive wear. I would highly suggest taking the bike to a professional for a proper diagnosis.

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