Are you running a spark arrestor type of muffler? If so remove the screen and make a pass down the street.
Are you running the air box lid? If so remove it and make a pass down the street.
If you are not running the air box lid, remove the air filter element and make a pass down the street.
Currently setup with the Aaen pipe, no spark arrestor, and no air box lid. Foam filter with an outer wear.
Pull the filter and make a pass? Sounds interesting..
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I have not had good results using an outer ware on the outside of a foam filter. The filter oil gets on the outer ware and then the outer ware acts like a plastic bag over the outside of the foam filter.
Remove the outer ware and make a pass down the street.
Have you changed filter oils or possibly over oiled the foam filter?
Among all the other things I've done to trouble shoot this issues, cleaning and oiling the filter was one. I always oil as directed, let the oil soak in properly, then remove the excess oil. I'll remove the outer ware in the morning and give it a shot.