77 KZ 750 B

would a bad head or base gasket cause the plug fouling?

bgulsvig wrote: would a bad head or base gasket cause the plug fouling?

NO.

bgulsvig wrote: I repaired the small slit in the boot but it made no difference. I did notice that I am using NGK B8ES spark plugs when my service manual says to run B6ES plugs. Could that be the cause of the black plugs and rough running?...

yes, running cold plugs can cause them to foul.

they turn black after 30 seconds of idling

When you cleaned the carbs did you try to squirt some carb cleaner through the pilot passages in the bowl? You should be able to spray some down through the pilot jet (or remove the jet before spraying) and see it come out the other side.

Not to throw a monkey wrench in, but since you say it is idling fine, the problem may not be pilot related. Pilot circuit effects from idle up to about 1/4 throttle. But your problem is acceleration right?

Have you checked and adjusted the timing with a strobe light? Check it both at idle and under throttle. The procedure is outlined in the shop manual if you have one.

4) Set fuel levels in bowls with clear tube

5) sync carbs

If you haven't done those two you're just spinning your wheels.

I'm gonna have to try some of the things mentioned here tomorrow.

I finally found the problem. I replaced the condensor and now it runs great!!!!