My 1979 KZ7650 B4 was off the road for a few months so, armed with a new battery and fresh fuel, I tried to start it. It fired up and ran for about 4 seconds, then cut out and hasn’t made a sound since.
It will crank over, there is a spark at both plugs (they are new), I removed and checked both carb float bowls, lovely and clean and no contaminants, checked the points and ignition timing, all OK.
I’ve even removed the air filter and tried some Easy-Start. It didn’t do what it said on the tin.
I am starting to suspect that the ignition coil may be weak and that the plugs may not spark under compression (it has two good compressions).
Do these have a problem with coils?