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oil blowing through air filter?

I have oil blowing through my air filter of my Yamaha YP125 Majesty. Bike runs well but at end of journey, oil is in air filter box and leaked out all over engine. Fresh oil change done recently and not overfilled. Any ideas?

spanner
May 2009
YamahaVehicles, MotorcyclesBlowing Air Filter
The only thing I can think of here, unless your bike has done a million miles, is that there could be a breather pipe from the rocker cover or crankcase area that is kinked or blocked, causing over pressurising of the crankcase, forcing oil out. Do check the oil level again though!

John
May 2009

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