I'm relatively new to glow engines, though I grew up on 2 stroke engines (snow-mobiles, dirt bikes etc.) What recommendations do you have for longest engine life and minimum problems with 2-stroke glow engines?? I recently purchased my first trainer (Hanger 9 Alpha trainer) with the Evolution .46 Which is broken in at the factory, and this engine so far runs excellently. I want to keep it that way and would welcome any tips you offer. One question is, should I drain the fuel tank after every session of flying? or is it o.k. to leave some fuel in the tank for a week or so? Thanks....