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Message: [QUOTE="sharky243, post: 1325280, member: 100273"] It's not so much a wear thing you have to worry about. Your piston takes the most abuse out of all the parts on the bike. Yes it may still run good and make lots of power well after 20 hours of run time, but the metal fatigue is something you can't see. The piston skirt gets weak from "fatigue". If it is left in too long, it can shatter and cause major internal damage. For the price of a piston and rings, I would change it before it blows up. That will keep the bike reliable. So let me see....Hmmmm! $200 for a piston, or $1000+ for a full engine job, piston, cylinder, crank, and possibly crankcases too ? HMMMM !!!! Hard discission !!! Just my 2 cents !!!! [/QUOTE]