I pulled the carb earlier this evening and checked the air screw setting, it was at one turn out, backed it out another half turn, then dropped the needle one position, it was in the third. Crispens things up a bit, most of the work I've done on carbs has been with round slide mikuni's and flat slides, took me a second to determine how to pull the cable. I'm guessing that the main is probably what came from the factory, the plug was an 8ES. I'm curious about suspension settings, started checking around looking for dials and knobs to play with the rebound and compression setting, but will wait for the manual to arrive to determine where the controls are and which way to turn them. I am already enjoying learning about this bike. Haven't quite got my hands around the KIPS yet, understand the raising and lowering of the exhaust port valve, that's quite common on snowmobile engines, but this thing with the subports and the Helmholtz Resonator is a little more sophisticated. Again appreciate all the info from those who have responded, and the stuff on the forum.