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Oil coming out of air filter

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Varedneck

Member
I have a 96 Fatboy EVO with oil coming out of my air filter and blowing back on the oil tank, muffler and everywhere else when I run around 70 miles per hour. The air filter is a K&N however it is mostly dry all the time. What could be causing this.
 
Varedneck said:
I have a 96 Fatboy EVO with oil coming out of my air filter and blowing back on the oil tank, muffler and everywhere else when I run around 70 miles per hour. The air filter is a K&N however it is mostly dry all the time. What could be causing this.
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Over full oil tank, umbrella seals in rocker boxes, remember when changing oil, there is about 1 qt of oil left in the crank case, try a bit less oil and see hoe it does, also check the hoses that run yo the backing plate of the AC for weak and or kinks:D
 
Varedneck said:
The oil tank level is good, so how hard is it to repair unbrella seals? Thanks Jack
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Do you have a manual and a Torque wrench. If yes do it its a good thing to be able to wrench on your own bike and get to know it a bit better JMO:s
 
If it is only happening at 70+ mph i would start by doing a compression test if there is some bore wear or damaged piston rings then some of the gasses caused by ignition will bypass the rings and pressurise the crankcase as the piston goes down the pressure is increased and will blow the oil from the crankcase out through the breather
if that is what is happening there would be no oil at lower revs and a lot at higher revs
If however its a wee bit of oil all the time i would suspect the umbrella valves

Brian
 
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