I have several OS 160 engines (3) and I never had a lick of trouble with them...in fact I think they are the best in this size in the hobby. Two of them are in Cubs, a DPM with the tank in the kit position, and a 1/4 scale Sig cub, and in a Precedent Turbulent. The two cubs have the ED 103 glo plug heater and the Turbulent has no heater. On the Turbulent, my field box cant light the two plugs in parallel, so I start the engine on one plug and then switch the plug and light the other one. Love those engines!