Im planning on buying those two for my 400. What is the best place to order from? What kind of gains should I expect? I read something about taking the choke off on the 400ex. What does that help? Thanks, Ant.

 

I dont know the best place to get those things but the reason you take the choke off of it is to let the air flow through the carb without gettin disrupted by the choke..so basically it just helps it flow a little better