Well yesterday I worked on the sled a bit. First I made something of a runout guage with a zip-tie to make sure the clutch was spinning true, and it looked perfect. Then I pulled the carbs apart and synchronized them and swapped almost every component from one side to the other. I also set both the fuel mixture and pilot screws to 1.5 turns out per a members recomendation. Then I swapped the reed assemblies and intake boots and installed them with new homemade gaskets. I also cut up some new gaskets for the powervalves. I wired the oil pump wide open and started it up. The pump is working since it fumigated the neighborhood, but I wasn't worried about that anyway since I premixed 50-1.
Well both of the plugs got real wet after idling for a few minutes, but the PTO side was very noticably warmer when I put my hand on the domes. I putted around the parking lot for about 30 seconds, blipping the throttle just enough to engage the clutch. The plugs looked just the same as before - the MAG side whitish and wet, and the PTO black and dry.
I believe I'm down to timing. Does that seem plausible? Should I buy a timing gun or take it to the stealership?