Question about 2006 Harley Davidson XL 1200 L Sporster Low

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My harley has a small leak coming from the air filter, the mechanic at the harley dealership told me it was the air filter. So i bought a new filter put it on and checked the oil level, with the bike vertical, added a 1/4 of a quart it of oil. I rode it to bikefest here in vegas, maybe 40 miles,everything was fine. The next weekend i rode it for about 10 miles and noticed the leak. Did I add to much oil because i checked it with the bike vertical, or is it some other problem?

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Regrettably, a small oil leak from the air cleaner assembly is "normal". This is because the EPA requires all crankcase emissions to be routed to the intake system so that it can be burned in the engine. The result is that oil mist in the crankcase vented condenses in the air cleaner and eventually drips out.

The crankcase vent for your Sporty is in the heads. If you noticed, there are two large bolts that are hollow holding the air filter backing plate on. The crankcase vents into the air cleaner assembly through these two bolts. There is an "unbrella valve" in the rocker box center section that allows the air to flow one way but not the other. There are baffles in this area to keep the oil mist to a minimum but still there is some in the air coming out of the engine.

There are a few kits available on the aftermarket for re-routing this crankcase vent. You can direct the exit anywhere you wish using one of these kits. Most people just route the hose down and exit it under the bike just in front of the rear wheel.

When adding oil to your bike, only add the oil when the engine is hot. On your dipstick, you have two marks. The upper mark represents "FULL HOT" while the lower mark represents 'FULL COLD", Do not overfill. Check the level with the bike on the side stand.

Good Luck
steve

Posted on Oct 16, 2010

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