Hi I've got a 2001 xvs650 dragster it starts and runs fine but once your driving it seems to accelerate fine up through the gears but as soon as you make it work and it gets up to about 70mph it starts miss firing and the engine management light comes on. When you stop bike the engine light flashes 4 times then a pause followed by another 4 flashes and just continues until you switch the ignition off any ideas?