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When do I rebuild the motor on my YZ?

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Maybe this is a stupid question but I dont know when to put a new piston in my 2003 YZ250F? I do the occasional track day but ride about 80% in the woods of Connecticut. The bike must have at least 100 hrs. on it and I can tell its getting a little tired but I dont find it to be inadequate at all. I perform all scheduled maintenace meticlously. I guess my real question is, if I dont put a new top end in it, will it do any damage to the motor or can I ride it untill it becomes absolutely apparent (whatever that is) that it needs new rings? Thanks

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you can get something like 200hrs on a new topend i heard! only about 40 hrs on my bike so im not shure

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