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Old 01-27-2013, 05:00 AM   #10
Blur
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Joined: Jun 2010
Oddometer: 4,396
I may be getting the 250X and 450X problems mixed up but....from what I understand, you probably want to swap out the valves also. Stock valves don't like long, sustained high rpm. I've heard good things about aftermarket stainless steel valves.

Thumpertalk would be a good resource: http://www.thumpertalk.com/forum/80-crf450x/
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