I have a ZXR 750 H1 thats recently developed a strange problem at the bottom of the rev range. The bike will fire up and sit idling quite happily when the engines cold, but as soon as it warms it has to be kept above 2000 rpm even when at a standstill otherwise the engine just dies. If I manage to catch it just before it stalls it literally takes minutes to get running smoothly and above 2k, whilst belching black smoke out of he exhaust all over the place.

Any ideas anyone? I'm guessing its either running rich or lean, but I don't even know where to start with this one.

BIKE WOULD BE RUNNING ON PILOT JET BETWEEN IDLE AND 2K. cHECK IT ISN'T BLOCKED WITH %$£! FROM FUEL TANK.