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If I put a 450r Carb On my 2005 400ex. What improvement am I going to be gaining? Will I have to change anything else when I put it on?
 

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You will be able to take in more air and more gas. Jetting will be required
 

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i have a 450R carb but i run an edlebrock its supposed to be a bolt on jet it and be done and a bigger carb gives you better throttle response
 

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A BIG PITA if you ask me. I put a 400ex carb on my 250X what a nightmare to jet, the air induction is so much larger. im pretty close now though I think when I install the Port and polished head it will be right.
 
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