I had a GMS .47 and it was strong! But,,,, it would sometimes die in flight when I reduced throttle from hi to low. You could even hear it wind down. It was like the glow (ignition) was removed! Just like when you ground the plug on you mower etc. No plug change or fuel line/tank change as well as hi/low adj helped. I was very impressed with the power, but the reliability was lousy.

ZB