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[QUOTE="uts, post: 821800, member: 49992"]
Hi Jasonwho,

you are right about the loads and rpm. I doubt a mower revs any where near as hard as a bike. I guess since these bikes are made for racing they are actually built to be rebuilt. Like say in the moto gp I am certain they would rebuild week in week out. Since most moto bikes are used for recreation and less for racing there is a clashing of worlds. I have a friend who races and does his top end every four hours or so. He says this is probably not necessary but even if he loses 5% power because of a small amount of wear this could lose him a race. Fair point. For rec riders who don't have that much cash, it's a trade off between regular top ends = $$$ and leave it until it breaks =$$$ but which = more $$$. Obviosly if performance drops then it's time.
I've always been unsure about this topic. 
All that said, I replace the top end on my CR250 about every 75 hrs of use. Well I did it once after about 100 and next after about 75. Second time I didn't measure the specs(except the bore) I just replaced the lot. First time there was little wear. Maybe I just ride like a weener.
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