Hi Dave B! I was looking for info when I came across this thread, imagine that! Well pistons, rings, gaskets, plugs have all been replaced. The cylinders were fine, they checked them at the shop. Brian has an idea that it might be the wiring to one of the plugs, the side that was bad, after playing with it last night (at 10:30PM in the cold).
He got the jetting chart from Kensington and it was jetted properly for here. If the wiring doesn't help he is going to play with the jetting a bit, tweak it and see if it helps.
I swear I think he's enjoying this.
Polarisrider1, I really appreciate your input! The more minds and experience involved the better!