I put in a new set of plugs, and 7mm ACCEL Copper Core Automotive wires on the bike, and the misfire seemed to go away, so I guess that since the front set of plugs was badly fouled, there must have been enough resistance to cause the coils to crossfire.
I drove it for 200 miles on the freeway, at about 80mph with my wife on the back, and it seemed to do OK, so that seems to have been the answer to my problem.

 

cool! i had no ideas

 

haha we once rebuilt an engine. When we got it torn down we could not find the problem we where after Took the plugs out of the heads and they were . toasted.