A lot of this depends on the area you ride. In dusty areas you will probably need to change the filter more often. I would change it every 25 -30000 miles in normal riding conditions. Plugs xcan go 25000 easily. think, how often do you change the air filter in your car?
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IF YOU'RE BORN ONCE YOU WILL DIE TWICE
IF YOU'RE BORN TWICE YOU WILL DIE ONCE
A NEW START ON 1/20/2017