Kawasaki KZ750 pesky problem


New Member
I have a 1977 Kawasaki KZ750 TWIN. Had the bike for a while and it ran great.

After 5 years of owning it. I just had the carbs rebuilt, battery changed, reg/rec changed. in the past 6 months Ive blown two ignition coils and have no idea why. Today I was riding and it was fine at 0-60mph. But when I pushed the bike to 65/75 it started sputtering and then died. Its NOT anything related to fuel. Of this I am certain.

On the way home, about 2 miles from where I live, I decided to really push it. I hit 75 mph on this hot day (80 degrees) and sure enough the bike died. Tried to crank it and it wouldnt start. Battery is good and was reading 13v at rest after it failed (I have a multimeter in the side bag at all times. Luckily this bike is easy to push and I was home 20 min after it broke down

What would cause an ignition coil to keep blowing like this? Its a bummer because they arent cheap ($60) and shouldnt be blowing like this to begin with.
I don't really know, could it be the voltage regulator? What is the charging voltage when your riding/hi revs?
What tests have you run other than fuel ? What leads you to believe the ignition coil died?
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