Question about Harley Davidson XLH Sportster 883 Motorcycles
Pressure build up and push oil pass the o-ring in the oil cap.
Check for a pinched/blocked vent line.
Possible bad piston rings and over pressurizing the crank case (compression blow-by).
Overfilling the oil tank. Check with engine hot.
Also, it could be just a aged/dried up/ cracked o-ring.
Posted on May 07, 2014
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Posted on Jan 02, 2017
A little pressure is normal on the sportster. I have seen where if the oil tank is over full it can blow the dip stick out. Most of us who ride sportsters keep the level showing on the dip stick about midway between the low and full line. Doing this will also help with oil blow by out the air cleaner.
Posted on Mar 31, 2009
the seal in your water pump but doubt it sounds like head gasket was it installed correctly? the head gasket is a crush gasket and can only be tightened one time after that it is junk and will not seal again there made from copper and crush really easy hope this helps good luck
Posted on Apr 30, 2010
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