Mountain bike
*Vultures Knob>>>Dirt Bike

Why is my dirt bike running really rough and blowing white smoke profusely?



Has not been used in a long time and I just gave it a tune up and I'm pretty sure I put it back together right, I sure its the piston oil seal, but could it be something else? any other thoughts?

It would help if we knew what the bike was.....2 stroke 4 stroke.
blown a gasket,
don`t ride it anymore till you`ve
had it seen to
Head gasket, scored cylinder, mis-adjusted oil injector... the list goes on.
Sounds like a blown oil ring on the piston.
it probably a stuck oil ring on the piston. or even if you "did put it back together right" if you didn't tighten the head enough/or proper way the head gasket might be leaking.
white smoke is caused by water if its water cooled
Always give year, make, engine size and model # when asking questions. A 2 or 4 stroke engine will give the same symptoms, but require different repair procedures.
--2 stroke. To much oil in the premix. Worn piston & rings and cylinder. Worn crank seal (clutch side). If water cooled - coolant leaking past head/base gaskets.
--4 stroke. Worn piston & rings and cylinder. Leaking valve guide seals. Coolant leaking past head/base gasket.
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