Re: YX140 Pitbike
so called CrankCase pressure, too much of it. being 4t is will spill out oil Through out Breather.
check that motor oil level isnt over filled.
determine if it has now leaked engine oil above Piston, Via like leaking valvestem oil seals.
determine also if the piston/bore clearence is too big, causing BlowBy into Crankcase...
Does the engine smoke alot/un-normal alot when cold started ?
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