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400ex carb how much do i have to do to put on 300ex:funnypolaris:
Subtract 100 ex's. JK. Moose or Billy should be able to answer that question for you. I think Moose has a 400EX carb on his 250X. If I remember right, they will fit, but you have to stretch the boot some to get it on. They will be able to tell you for sure.
 

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They fit fine.The only thing is jetting and your intake boot on the filter side is hard to get on.You have to heat it to stretch it a bit.
 

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More air flow.The 400ex carb is a 38mm rather than the 28 or 30 the 300ex has.
 
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