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So I have a 2007 trx450er I've been building slowly over the last year to drag race on dirt and play with around the house getting ready to go to a 520 bigbore non stroker 14:1 piston and a race ported head im stuck on cams id like to go with stage 3 hot cams but not really trying to replace valves guides and springs just to do so what advice do u guys have I would also like to know if I should go with a bigger carb I have stock on it with 480 big bore 12.5:1 compression piston fuels custom open intake on pump 93 runs pretty good right now just don't have what I want as far as torque and power so going bigger should I get a bigger carb or just rejet mine
 
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