Yeap, the intake valve was too tight and therefore not closing properly. Funny that the engine still ran relatively fine but now that I think of it, it was missing some of the 'umpf' I was expecting. Guess I shouldn't have listen to the instructions which said that the valves were adjusted from the factory, right?

It now works perfectly on the ground, is OK for the first 4' in the air, then quits on me while I was hovering my Flip 3D 6' off the ground, landed inverted and broke the rudder, no big deal.

I was using some 3 year old YS20/20 PowerMaster fuel, using the normal 14x?? wide APC prop that everyone is using. I will try some 30% new heli fuel next time and see if it's better. Maybe overheating as well (Florida heat is coming!), although I removed the cowling to prevent that when it stopped, so that's out of the way. Any other ideas?

Thanks
Ben