I had it up to 80 mph yesterday. It runs fine except for the idle. The plugs,wires, cap, rotor, and fuel filter have been replaced recently. In reguards to the choke it starts cold and once the choke disingages the engine idles rough and stalls. The choke is not adjustable on this carb because there is a pin locking it in place which leads me to believe the problem is coming from somewhere else.