Actually, it might be a doable engine for the Pizazz. I have a Webra Silverline 40 and I first installed it on a Thuder Tiger Fun Tiger, which topped out near 5.5lbs. Before I CG'd the airplane I had an experienced pilot fly it. She flew great. Unfortunately, when I CG'd the airplane I found that because the engine is so light a lot of weight was needed in the nose -- this effectively robbed the airplane of power and she was lackluster. I replaced the Webra with an OS FX .46 and the TT lived happily after that.

I currently have the Webra on a Model Tech ME-109 and that combination is ideal. I'm even running a 3-blade prop.

It is my understanding that the newer Webra 40gt is a stronger engine than the Silverline???