2004 CRF 250 Losing oil through engine breather hose by willy734 » Sun Sep 04, 2016 7:03 am
Just rebuilt motor. Replaced all crank seals because I thought the transmission oil might be leaking into the crankcase. Still coming out of the breather hose. Measured the amount of oil that came out of transmission side and it was the same as the service manual recommended. So I know it's not from a leaky right side crank seal. Also measured the amount in the engine side at draining and it was half of the recommended amount that was put in. So it has me thinking it is just blowing out of the engine side and I don't know why. Maybe something to do with the pressure release valve. Please help it is about to drive me crazy!