you shouldn't be tuning the carb when it's cold, so the choke shouldn't be the issue. I just rebuilt my carter and it made a big difference with the idle. It was complete crap before. Is your carb used? If so, spend the $20 on the gasket kit and replace them and the O rings. then, while everything is out, I ran a fair amount of carb cleaner through all the passages. put it all back together (twice because i put the floats on upside down) <img src="/forums/images/graemlins/scared.gif" alt="" /> Then adjust the throttle positioning screw until the screw touches, then turn in 1 1\2 times, no more. Adjust the idle mixture screw so it barely bottoms out, then back it off 1 full turn. adjust in 1\4 turn incriments until you get it where you want. I'm running around 600rpm in gear and 850ish in N. For the electric choke, you have to preload the spring by turning the choke one way or the other, then lock it down with the hold down ring. There is a fast idle screw that just holds the throttle position a little higher than the regular screw, that one i tuned it until it was around 1500rpm(i think). hope this helps.