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Old 01-27-2013, 04:00 AM   #10
Screwed and stapled
Blur's Avatar
Joined: Jun 2010
Oddometer: 4,130
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:
"Make me one with everything" - the Dalai Lama, while ordering a pizza.
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