I'm not positive, but I may have screwed up my choke? When I start with the knob pulled OUT on a coldstart, it won't start at all. I have to push the choke knob IN to start it. That seems opposite to what I thought. Also, the tach reads about 650 when it first starts, and giving it throttle too quickly will stall it. It takes about 5-10 minutes of warm-up for the RPMs to gradually increase to 950. After that, it runs like a champ. Responds to throttle fine.