I questioned the wisdom of the 50/50 and expected to work back down to close to 33/66. I have a muffler that is a little more open and will try that. As far as using an R/C carb, I have, a ST 51 with muffler pressure on gas only and spark it seemed to run as well as the Walbro. When I pulled the fuel line off of the carb while the engine was running I got quite a stream of fuel so muffler pressure seems to work. I would believe either carb would work. It may be a week or so before I can try again. Thanks for the imput, everyone around here is plug and play and can't think outside the box.