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cheapest way to rebuild valves?

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my 06 crf cupped the valves beyond repair. they cant be adjusted back into spec. still starts with sme effort and runs great oncce started. i want to sell it now but not screw someone over so whats the cheapest way to rebuild my valves? if i were to rebuild and keep it how long could i expect of valve life? sorry for my ignorance im a two smoker guy.

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probbably oem valves make sure you get your seats cut

 

you can probably get close to 100 hours if you're not always bouncing off the rev limiter... I got 80 and may have had dirt getting in the engine

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You can expect to spend $500 or so to fix the problem correctly. You will most likely need new valves, new guides, new seals, new springs, & have the seats cut, or replaced if they are too far gone. also need new head gasket, possibly timing chain, piston & rings, cylinder base gasket, and this list could go on & on depending on how many hours on the bike. It might even need a crank.

 

Or, sell it as is and let the buyer know that it needs those parts. Obviously you will get more money with a running bike. But, if the valves are as bad as you say I'll bet the rest of the bike is probably in need of some TLC as well.

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