I have an EVOLUTION .46 with about a hundred fights on it that is now giving me fits. I installed the engine in a trainer last summer and flew all summer without needing to make adjustments. As the weather got cooler, it started going dead-stick. I don't have a lot of experience with glow engines but I have tried just about everything other flyers have suggested. New glow plug, new fuel tubing, I have adjusted the needle valve WAY rich and nothing. The engine seems to run fine on the ground, but if I tip the pland vertical the engine dies almost instantly no matter where I have the needle valve adjusted. Is it just too darn cold? I have noticed another guy at the field struggling with his EVO.

Thanks--