Question about 2002 Harley Davidson XL 1200 C Sportster Custom
Your crankcase pressure is supposed to be vented though the heads. Take your air filter cover and the air filter off. The backing plate is held on by three small screws and two large bolts. These two large bolts are hollow and the vent the crankcase into the air filter as per EPA regulations. Check these and make sure they're open.
Now, this pressure gets to the breater tubes though an umbrella valve in the center section of the rocker box cover. This umbrella could have become brittle and flexing as it should be but I've never seen this.
Check the two large bolts and make sure someone hasn't closed these off to keep oil of the air filter. This is common if someone has changed the air filter assembly.
Posted on Aug 28, 2010
Testimonial: "thank you very much!!! that was very helpful, i did go to a hypercharger, i better stick with s&s teardrop filter,"
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Posted on Jan 02, 2017
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