Dont mess with the Trainer Power system... The 3 bladed prop has HORRIBLE performance and the metal engine mount that comes with the engine is very heavy [:'(]

The Evolution engine are GREAT though, get the .46 NX and put it on a glass mount with an APC prop and you will be happy The Evolution starts easily, runs good, and has lots of power ! What else could you ask for. You will not be dissapointed with this engine.

JettPilot