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04 crf250r full rebuild question

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So my valves went out right after I bought the bike So I want to just rebuild the whole thing while I have it apart. So my question is what kind of setup have you guys had luck with?

I'm currently deciding on whether or not to go with ss valves or the tri ni coated titanium with the copper beryllium seats

Also what piston rod crank would be best for longevity I ride for fun so I'm not worried about losing a horsepower or two to have something reliable

And last what cam would be good oem or aftermarket?

For a reference I ride 95% sand and 5% rocky terrain

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Fastheads do nice work the head they did for me ti valves copper beryllium seats has been great 180 hours so far no shiming required at all I just cheak them once every 3 months go oem crank for long trouble free service

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Im definitely going with fast heads and that's the kind of life I want out of it I'm sold on the beryllium seats. Thank you

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