This is a common problem with the older bikes. The reason is the position of the oil tank and the type of oil pump the engine is equipped with. With the tank being higher than the engine, oil will seep past the check ball in the oil pump and into the engine. When you fire the engine up, the oil pump cannot pump the excess oil back into the tank quickly enough and some gets blown out of the crankcase vent. If you allow the bike to sit for extended periods of time, this problem is worse. It's commonly called "oil sumping" around here. When you hear an old Shovelhead rider talking about his bike "puking", that's what he's talking about. I've seen those bikes puke nearly a quart of oil after sitting a few months. I've seen Ironhead Sportsters completely drain the oil tank into the engine. This is normal to a degree but if it gets too bad, you can "reseat" the check ball by removing the plug above the check ball on the oil pump and use a small hammer and punch to gently tap the ball into the seat in the pump. Then, remove the old ball and drop in a new one.
Good Luck
Steve
When the bike sit for a time the crank case traps air, so when you start it pushes oil out [about a pint and it looks like a quart. to solve this I turn the key on and bump the starter several times at short bursts. then start bike normally. doing this it burps all air out for a clean start Fran
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