I am having trouble getting my Megatech .46 2-stroke adjusted and hope someone has some suggestions. The engine ran fine on the bench- it's now on a Great Planes P-51 mounted inverted with standard muffler. It's a brand new engine with about 4 tanks through it now. Mounted on the plane it runs ok with the glow starter on for the most part, but seems to run really rich on the low end and won't lean out. I just put in a brand new plug. I noticed fuel was dripping from the carb after it's shut off for the first few minutes. Won't transition smoothly but runs ok at full throttle even with the ignitor off. I can also see bubbles in the fuel line to the carb while it's running. With the inverted engine the carb is slightly below the tank level, but not much and looks like it's siphoning a bit. It doesn't seem to matter what I do, the mixture won't stay consistent and I'm having to change it at different throttle settings to keep it running smoothly. Unfortunately, inverted seems to be the only option recommended without going to the Pitts muffler. I have left off the cowl and fuel filler valve until after get it adjusted. The muffler has a pressure tap in front of the baffle and it seems like it may have too much tank pressure. Would it help to remove the baffle, or anyone have any other suggestions? Thanks-