Sorry for the lousy cell phone video, but I just did a top end on my 99 trx300fw, used jug and piston in good shape miked out within all specs, new rings, gasket kit, etc. Did break in procedure per the service manual.went from burning lots of oil with tons of smoke to no smoke whatsoever, and oil level consistent.

Video was taken after about a half hour ride varying from slow and technical to road conditions. Does this motor sounds normal? I’ve never had an atv to compare to and it sounds a bit loud to me. Seems to have gotten louder when hot.