Oil blowing back through breather pipe 1991 heratage softail

SOURCE: oil blow out the breather

An overfull oil tank will do it. Even if not overfull just about all harley's will blow oil out the air filter. Unless there is a bunch of oil coming out, it's not a problem What I've found is that the air filter eventually gets saturated and then starts to leak through. The level in the oil tank doesn't seem to matter. If you change the air filter the problem goes away, until the new one gets saturated and then it starts all over again. My plan is to get a K&N air filter, which you can clean yourself and save having to buy a new air filter every 4,000 miles or so.

SOURCE: oil blow out the breather

too much oil; bad umbrella valves in rocker covers;

SOURCE: 2006 KX250F blowing oil out breather should I be concerned?

hi
ther is a chance that being over filled will blow out of the crank breather so drain off to the correct level if then the bike still does this then you have to high crank presure meaning the bore and piston/rings are badly worn
thanks jay

SOURCE: i just changed oil in softail and now it is

Was this your first time changing the oil?
Sounds like you may have drained the tranny and
over-filled the motor......
Did you have a book/ manual?

Harry

SOURCE: Oil blowing from breather pipe Honda 250

Mate.Sorry to tell you but the piston rings need replacing.If the motor is pulled down the piston rings will be very thin and need replacing.Possibly with a new piston as well.Seen this before.Its not too bad cost wise,but it does need to be done.Hope this helps