I just bought a 99 wr 400 (what a bike!). The bloke who had it before me has done a bit of work on it, and good work too. the only drama i have is (i think) the oversize jet in my carby, through the bush is unbelieveable, goes like a shower of you know what! However on the road at about mid revs runs as rough as guts. Am i on the right track thinking this may be the jet? any reccomendations on the size i should be putting in?