I have a new 61NT engine. I had to adjust the low speed needle to keep it running at low throttle. The first couple of flights had the engine running ok but nothing special. Then it really started to pick up power. I have it on a Kaos 60 and now the speed of the plane is getting scary fast with an APC 12-6 on it! I wish my tach wasn't acting up so I could see what its running at.