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Discussion Starter · #1 ·
I have a 07 400ex with a k and n intake filter and a prefilter, its a mods3 stage 1 kit plus a yoshi r2 full exhaust system, what should I jet my carb too and what do I need to buy, also what's the next step to make it fast before I bore it to a 440
 

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camshaft, change up the sprockets,tires
 
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