I have a 185 Bayou that recently developed a noise in the engine, it is not a knocking noise. Also the light begin to flicker along with this noise. I'm not sure what is going on with the engine. It starts fine but after running for a little while starts making the noise. I was wondering if the light indicated that it is something to do with the magneto that drives the lights. I don't know much about atv's just ride them. Any help would be appreciated.