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Lifan 124cm3 pit bike motor blowing oil?

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does anybody know why my lifan 124cm3 motor keeps blowing oil out of the crankcase breather hose constantly while riding?

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Oil is blown out by excessive pressure build-up in the crankcase.

meaning combustion pressure is making it's way past the piston & rings.

 

Is there also a possibility the oil was overfilled?

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Oil is blown out by excessive pressure build-up in the crankcase.

meaning combustion pressure is making it's way past the piston & rings.

 

Is there also a possibility the oil was overfilled?

is there any way to fix? the oil level is fine 

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another simple check would be to confirm the vent hose doesn't have any restrictions,

 

meaning pressure gradualy builds-up until high enough to overcome the restriction and then blow out,

once the pressure is released the restriction (say a pinched hose / connector etc.) would close up again.

 

Also, if you had the engine's specs would could run a compression test to confirm yours is within spec.

or better yet a leakdown test would show how much loss there is (for you to search what is the acceptable %)

Edited by mlatour

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