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Hi, Chasity oil leaking from your air cleaner is caused by oil carryover from the engine. For whatever reason, the breather system is not separating enough oil mist and air from the piston downstroke. There are cheap and quick easy fixes and there are more expensive ones. First, make sure your breather hoses are not dry and cracked if they are ok you can start by trying the following:
1. Run your oil level half way between the add and full mark when hot.
2. Run oil breather lines from the head into a TEE fitting below carb/induction module then a single line into a mini filter under the frame.
3. Purchase Arlen Ness Super Sucker.
4. Replace umbrella valves and realign oil pump.
5. Upgrade oil pump and cam plate.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below and for more specific information or questions at no charge please feel free to contact me at firstname.lastname@example.org. Good luck and have a nice day. Understanding Blow By Several Articles Leaking oil threw breather Harley air breather oil issue and filters How to stop oil leak from air filter by Dmitry
Check your crankcase breather hose. On the '88 model, it originally came from way down low behing the oil pump up to the backside of the air filter plate. If the bike was purchased used, the original owner may have rerouted the hose in order to avoid oil getting into the air filter. Find the crankcase breather hose and check to see if it has been plugged by something or has become crimped.
I'm confused by the term "breather valve". I don't know of a breather valve on the engine. If you mean the "breather gear" in the cam chest, this is good as the originals were made of plastic. These would break a tooth off the gear and quit turning. Usually the broken tooth would lock up the oil pump and indicate a problem in the area. However I have seen on occasions that the oil pump was not locked up by the broken tooth and the engine would build up too much pressure inside. I've seen the pushrod tubes start to leak because of this. If I have misunderstood and you have not pulled the "nosecone" on your engine to check the breather gear, that could be your problem as well.
But, do not pull the nose cone unless you know what you're doing. I've fixed several bikes because the owner went to check the breather gear and didn't know what all was involved in doing this. The nosecone would come off about a quarter inch and hang up, would come the rest of the way off and wouldn't go back on either. If you need specific instructions on how to take the "nosecone" off, repost and I'll tell you how to do it. You'll need a pair of tappet block pins to do the job.
Take out engine Strip down and replace the Piston rings and check bore if got a ridge in it where the top ring stops then rebore it and fit new oversize rings
If worn bad then also new piston as well thats the only way to stop the oil from coming out of the Breather and give you back the power you lost ..
Easy done so do it and enjoy riding the Buggy
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
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.