On my 03 DRZ 450S the stator went south backfired and stoped runing and had to push it to my friends house after replacement it ran perfect . I also had a problem not starting due to a bad battrie it would fire off but it would not stay runing. Hear are some resistance checks. the primary and secondary coil check primary resistance between groundand the spayed connector on coil it should be .1 to 1.0 ohms. check secondary reisitance between spayed and the plug wire it should be 12 to 20k ohms. The pickup coil and signal coil resistance are blue to green 390 to 600 ohms black to white .05 to .2 ohms.