2019 yz250f first top end

I’ve been riding this bike since December and have put 54 hours on it. I was gonna change the piston at forty hours, but got lazy, plus it was running so good. Well, it was still running good and I had some free time , so I got her done this week.

I stuck with stock Yamaha piston and rings for replacement. The old piston and rings looked good, a bit of wear on the exhaust skirt, but more than good to go more hours. The valves hadn’t moved at all, no adjustments needed, cam chain fine, a bit of dirt on the outer butterfly of the throttle body, cleaned it up and put her back together again.

I’m going to change it again at about 50-55 hours next time. I was impressed with the condition of the stock stuff after the hours I put on it and am pretty pleased with the durability of this bike.