Hello everybody, trying to garner piston change information for my new '16 yz450. I'm up to 22 hours now and the bike is running great. Strong motor on this bike. I want to keep the bike in good condition and well maintained, but don't want to do unnecessary maintenance either. I've been researching and get mixed opinions about piston change intervals. Im a solid B rider. Strictly motocross. 90% practice, 10% race. Im guessing I could go 50 hours or more. Some reports swear nothing is wrong with them at 100 hours. What do you guys think?