I have a 1990 Kawasaki 650 SX with no spark on the front cylinder, and just OK spark on the rear. I disconnected the kill switch so that is out of the picture. As I turn the engine over once in a great while the front will spark, but very weak. The rear cylinder seems a little weak as well. Just wondering if the stator or coil could be bad. not sure how to test them. Any help would be great.