Why does My oil cap keep popping off when I rab my 883 sportster up The oil smil like There may be some gas in the oil

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Hi Anonymous, the engine breather system on Harley Davidsons has NEVER been famous for being a trouble free zone. Oil tank dip stick launches happen far to often than they should in my humble opinion. As engine sizes get bigger so does the volume of air created by the piston downstroke, and for the most part the diameter of the breathing excape route stays the same. The usual cause of dipstick launch is a worn out rubber seal that requires no effort to remove or install, a new rubber seal requires some effort to push it in the oil tank and some effort to remove it. Next in line is an oil tank the is over filled. Try a new dipstick and running your oil level half way between the add and full mark. Good luck
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