I've brought a "99 WR400 a couple of weeks ago and notice it bogs when accelerating from idle, sometimes stalling, also at full revs it starts missing. It also seems to use excessive amounts of fuel (80km per tank full). Apart from a procircuit pipe the bike is pretty much standard, could it be a problem with the accelerator pump? Also what size jetting should it have and setting on the primery jet. The person I got it off was pretty rough - missing spokes, 1 fork on 20 clicks rebound other on 10, comp not much better- so slowly working through the whole bike.