I have a few extra Evolution TPS engines from Hangar 9 P-51 Mustangs that I don't fly anymore. I also had a new Hangar 9 Tango in need of an engine. Instead of putting out the $'s for another engine, I decided to try to get one of the TPS engines to respond as well as the Evolution 46NX I use in a Twist 40.
I removed the flywheel from the TPS engine and pressed the outer weightof the flywheel off of the aluminum spool piece. This was easy using abench vise and some washers. I replaced the aluminum spool piece to make up the space on the drive shaft andmounted the spinner/prop inthe normal set-up.
The first test flight of the Tango with modified TPS engine was very rewarding.The engine responded to throttle input aswell as the Evolution 46. The idle was just a smoothas the idle with the intact flywheel.

Anyone know of any problems that mayoccur by running one of the Evo TPS engines without the flywheelweight?

With the research I haveperformed, the TPS enginespecifications are nearly identical to the 46engine. If this works out, you shold be able to save a significant amount of moneyif you have one of these TPS engines not in use.The difference in retail pricing between the TPS and the 46NX is $40.