plasticmaster -- I ran a Poulan 42cc on Gas/Glow with very good results. You will need to open the needles a to richen the mixture for Gas/Glow. Try one full turn open on both needles. This will likely be very rich, but it should run and then you can start tuning. Yes, I have found that a new or rebuilt engine will often "use up" a glow plug while breaking in. (First tank or two of fuel). I also use a cheap or old plug to break in my engines. I believe your glow connector will work. I use a Dubro connector on mine. You will probably see a small gain in power. I generally see from 150 to 300 rpm gain when switching to Gas/Glow.

I had a gutted, free flowing stock muffler on mine, and a 13.5mm carb, and it turned the same prop you are running at 8400 rpms.

MikenLapaz-- I don't think the added nitro you mention will lower the methanol content enough to be a problem. The only caveat is if the added nitro would cause detonation. It all depends on the given engine and one wouldn't know without testing. Nitro generally gives more power and better idle and throttle response, IF the engine can run it without detonation. If you run into detonation, you might try a colder glow plug, like a two stroke plug. If you have the normal mix, here's one way to get an idea if the motor might support more nitro without problems. When the engine is all properly tuned, warmed up, and the mixtures set just right, see what it does when you remove the glow plug power. If the engine drops in rpms, it can probably take more nitro to good effect.

AV8TOR