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crf250r VS. crf450r

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i had an 04 crf250r until it was stolen about a week ago. :thumbsup: im looking to replace it but im wondering if i should go with a new crf450r instead because my 250 was nothing but problems. my question is how are the 450's with durability as far as the engine goes(valve/piston life, etc.) compared to a 250? also how long can you go under non-race (normal riding conditions) until youll need to rebuild the topend? any feedback greatly appreciated. thanks a lot.

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I went around 200 hours before replacing valves. I replaced the piston and rings but the original parts didn't look too bad. I ride everywhere, trails, track, desert and sand dunes. The whole project including Ferrea valves and springs cost just over 5 bills.

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