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Discussion Starter · #1 ·
I have a 2014 yfz450r with an fci, full yoshi, and msd. I want to get a big bore kit and a set of cams before I get my head ported by mmad. Can anyone point me in the right direction? I am mainly going to be drag racing. What bbk would give me the most power? And what displacement should I go with. 480, 501, 520? I just want to get the best one for power and that is going to hold up and not have to be rebuilt every time i ride it haha
 

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Might as well just talk with Geoff @ MMAD and get his current recommendation. A JSR 480 is going to be the most reliable followed by an Athena 480 kit.
 
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