Trying to gather information on piston change intervals. Ive searched and came up with a wide variety of answers, so I figured I would start one more thread! Lol. Ive got 22 hours on my new 450 right now and its running like a rocket. BUT, I know the time is coming. So, how many hours do you put on your 450 piston before you change it? I ride mx and am a pretty good rider. Id say average B rider. I only race every once in awhile, so 90% practice 10% race. Anybody got any good advice?