OK, 3rd yr flying. Not an expert, but know internal combustion engines. First Gasser was a 3W-150. Ran great, never touched the needles. Got a 3W-100 I have more adjustment issues than you can imagine. Get it running perfect on the ground and it boggs, gurgles and sputters in the air. Finally sent it back to Cactus. Jury is still out.

Just received a brand spanking new 106. A real freeking power-house! First four runs, the engine felt progressively fat each run. Leaned top end out about 1/4 turn. Perfect! One week later, the engine wont get any RPM, felt lean, bit my finger on the prop spin BIG TIME issues. Dinked around and got is perfect on the ground. Nice slow uniform idle, SNAPPY response, smooth and nice RPMS. To the air I go... The POS ran like CRAP. Totally way too fat. Barely got the thing in. 1/8 turn leaner, 1/8 turn, 1/8 turn... Five or six flights and I finally gave up! Could not get it right.

Is there a recipe to this, I must be totally tune disabled!! What am I doing wrong!