I know how to ride a dirt bike, but not much mechanically. So this might be a basic question.
I bought a used XR 400. It has not burned oil until my last ride. I noticed last ride that when I start it COLD it blew a lot of blue smoke, and I started it up today and again it blows a lot of blue smoke.
I have no idea if the rings have ever been adjusted. Could it just need that? I hardly lost any oil, maybe a tenth of a quart.
I also noticed lately that is seems to be sucking air. It bogs down more often. Could it be that it is just to rich? Maybe I need to cut a hole in the air box and see if that leans it up?
Clueless in Seattle.