Need help with 400 to 450 carb

[Dicestyle1912]

I wanted to put a 450r carb on my 03 400ex and wanted to know what all needed modded or bought to do so. Thanks cody

[rob_990]

i know you need the 450 throttle cable,a new gas line,and widen the air box where its hooked up too the carb and also widnen where the carbs hooked on to the motor. i dont know what else you need off the top my my head but go in the ex section and theres a sticky at the top of the page where youll be able to find more info on it.