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How many hours for a Birthday 09 CRF450r?

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My trusty has 47hours of woods riding on it. How many hours in the real world would you run before give it an overhaul?

I have a piston, rings and cam chain to go in. I shimmed the valves at 40 and they had closed ever so slightly.

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i wouldnt do it till it needs valves, or until u have a problem with it

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I am doing mine right now, @ 100 hrs. The piston looks really good for the hours(almost no wear), but i did have quite a bit of blow by, i would imagine its from worn out rings. The cam chain is not stretched or kinked, so i will keep an eye on it. I would at least replace the rings at 50 hrs.

E

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I replaced rings at 50hrs and everything was mint inside no signs of wear. Now I'm at 110hrs and it's ready for new piston, rings and intake valves.

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I did piston and rings at 75, another piston and rings at 150 plus valves, springs, and cam chain. After seeing what things looked like on multiple occasion this is going to be my new schedule.

50 Hrs new rings

100 Hrs piston & rings

150 Hrs valves, springs, cam chain

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