Hello; Whatever it takes to get you in the air, I suppose. You can join the snooty four stroke club later if you like. I use four strokes too, but I still have a pair of ST 46's for a twin project. They work for me, probably 6 years old now.Thunder Tiger 46 Pro, that is what they are. If it is all that is stopping you flying, any engine you buy nowadays will do the job

note to the 4 stroke guys
Lets hook him on flying first, then the four strokes.

I was flying a senior Telemaster today with a Saito 91, doing stationary rolls into the breeze. I don't think a two stroke would do that, at least not as well. There were a few walk-ins that were watching, later they all said how they'd enjoyed the day.