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Message: [QUOTE="mkelly04, post: 1298458, member: 79086"] Everyone is different. There are so many factors involved it is hard to say when you should change the piston and rings. Obviously the harder you ride the more often you will want to replace the piston and rings. A C class mx rider could probably get 40+ hours out of rings and 80+ out of a piston. I know I could get 80 or so hours on my 250 and everything was within spec. My suggestion would be to tear it down at around 30-40 hours. While it is taken apart you can get an idea of how much wear you are putting on the bike and then you can adjust your maintenance intervals accordingly. [/QUOTE]