I read that Factory R&D makes an acelerator pump cap for the 00 426F . There design makes the fuel atomize more, which in turn stops the bike from bogging or coughing . I talked with Factory R&D and purchased one of these acelerator pump cap/covers . I haven't recieved it yet but when i do i will be out on the trail shortly after and will give you the results !! Factory R&D told me that it solves the problem and if your not satisfied send it back , no probs !

CONTACT FACTORY R & D AT 949-206-0894

i just ordered a p-38 from factory r+d(same thing you ordered) for my 400 i'll let you know if it works

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