Motorcycle Repair: Ignition Problem, suzuki 500gse, plug caps

Question
I have a 1996 Suzuki 500GSE. Trouble starting. Eventually starts but with low RPMs and when throttled up it dies. I found only one cylinder is operating normally. It has a spark. The other cylinder at first appeared to have no spark. However, when I disconnected the boot and let the spark jump to the electrode the engine revs normally! When the boot is re-connected the problem reappears. Cleaned both spark plugs and checked HV wiring for frays/cracks. Switched spark plugs to opposing cylinders-the problem stays with the "bad" cylinder.I'm mystified. Have any ideas Mark? Many thanks from this worthless, humble servant.

Answer
Hi James,

You're funny!
(Many thanks from this worthless, humble servant.)

I suspect the spark plug cap is defective. Verify by switching ignition coils or plug caps.

Otherwise, check for loose connections and dirty or corroded conections and grounds.

Respectfully,
Mark Shively