Yamaha moto 4 110 crank case vent tube spitting oil
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Makers usually run crankcase vent tubes into the airbox, does your vent do this? Is the sump overfilled, as excess oil will be blown out of the vent? Other possibility is badly worn engine, making the crankcase vent gasses blown past the piston, you would get blue smoke from the exhaust, and high oil consumption if this is the case.
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