Rcpilet, a question for my knowledge. You know the instructions say to have the regulator within an inch, as I recall, of the carb. That means on engines like the OS 91 FX that the regulator is between the needle valve and and the carb. Did any of your engines set up this way? I've heard good things about the Cline. Maybe I'll find a future use for it. By the way, if you've talked with Bill lately you know he is trying to sell the regulator(proportional fuel control system, more properly) business. Someone may have already picked it up by now. It was last summer that I talked with him a couple of times.