At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
That could mean your PCV valve/system has a problem and isn't removing excess pressure from your crankcase.
During the power stroke of the engine, the gasses from the crankcase are forced upward, and if the PCV isn't functioning properly to route the gasses to the intake to be burned, the pressure will push oil upward past the piston rings and into the intake.
I'd start by checking/testing the PCV to make sure it's functioning properly. If you have a PCV valve, it may need to be replaced.
you need to clean out the sump air vent. and change the filter for the air breather. some are fitted with a clean easy filter you take off and wash out.
It helpes if you have oil only 1/2 way up on stick,, + some tie the breather tubes together w/ a T then down to a small breather / filter ..& mount filter under motor.. may i suggest harleytalking.com good group have helped me...
Since there is no "center section" to the rocker boxes, there is umbrella valve in there. There is a "breather" in there however. Now, whether or not it will cause excessive oil to get into the air filter, I don't know. I don't work on models as new as this. It's simple enough to put the front rocker box and check. Take a look here.
Regrettfully, all Harley engines suffer from this problem to a greater or lesser degree. It is due to the use of the single crankpin design of the engine. This design is what gives the Harley-Davidson it's distinctive sound but it does create a tremendous amount of crankcase pressure. This is due to the two very large piston moving up and down in unison with each other.
The late model engines went to what we call a "head breather" design in that crankcase pressure is relieved at the top of the engine rather than the earlier design that relieved the pressure at the lower side of the engine. This is accomplished by the use of "umbrella valves" in the center piece of the rocker box covers. The "umbrella valves" are made of synthetic rubber and open and close the breather passages from the rocker box to the air filter box by flexing in responce to the crankcase pressure. Due to repeated heating and cooling, the umbrella valve gets a bit stiff and fails to seal completely allowing oil to be blown into the air filter. Sportsters are more subject to the problem than the Big Twins for some reason.
Most people purchase one of the aftermarket crankcase breather systems and install this or they simply reroute the crankcase breather to the underside of the engine using longer hoses and plug the holes in the backside of the air filter assembly.
However, if the laws in your area preclude you of making any modifications such as this, I would purchase a K&N washable filter and install it in the air filter assembly. These filter are washable and can be cleaned and reused over and over again. As I said, this oil getting into the air filter is aggrevating but also normal unless it gets to where it's pouring out everytime you ride it after cleaning. At point, you need to replace the gaskets and umbrella valve in the rocker boxes. Good Luck
Here is a link for the manual....Sorry for the quality, it's printed on glossy paper, and difficult to scan properly. http://rapidshare.com/files/285883408/GT-1200C_Manual.pdf.html
Click on Free User, wait the few seconds, and then click on the download button.
change the air filter they spit oil out of the breather tubes that are connected to the rocker boxes when the air filter gets dirty the air pressure lowers on the cleaner side of the carb and then the fuel wants to go to the lower pressure making it come oput of the airfilter side
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.
×