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Discussion Starter · #1 ·
i have a 04 yz 450f that i am roadracing. looking to get a little more hp out of the bike, thinking about cams and porting. it currently has a 480 kit, fmf slip on, and kibblewhite valves.
any input?

-jamie
 

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look into doing a velocity port job, from what i know you epoxy the intake port to make a smaller runner ie making the air travel faster into the combustion chamber and cramming more in.. its how the 06 and up are stock i believe..
 
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