I fly mine with a GMS .76 and a Graupner 11x8 Pusher Prop.
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So I adjusted the high end needle richer until the head temp dropped to 280-300 degrees F which was perfect.
Do you remember the rpm at the lower temperature setting?
First flight today was great. Second flight over an hour later was rich, rich with no change in needle setting and a disaster. Wallowed through a 180 degree turn and was about to go over the pits and parking lot when I aborted and paned into the grass out of sight and far away.
Bill