I had an Evo .455 on my Tower trainer. Ran fine till the temps got in the low 30`s. and then it was very unrelieable.

Switched to a SuperTigre GS40 , cheap little engine , but a little hard to dial in, and had to go thru the carb to get everything sealed.

After dumb thumbing the Tower trainer , I built a LT40 and installed the Evo. Pulled the 70 in. wing around a little to much power and back to the flame outs when the temps fell , so I installed the GS40 on it. This is my favorite engine, and is a great match for a trainer size 40. The 46 I believe is to big for a trainer, and was teaching myself some bad habits on take off and landings , by having the extra power.

It`s hard to explain, but the trainer handles like a different plane with the smaller engine on it. It seemed so jerky with the .46 and I really did`nt care for the way the plane flew with it installed. IMHO , over powering a trainer will teach a student bad habits on take off and landings and performing maneuver's. I was relying on the extra power and not my flying skills.