ORIGINAL: CGRetired
Well, I would say that for a beginner, a two stroke is the simplest setup for a trainer aircraft. Four stroke engines can be a bit difficult for someone that is not familiar with them. I'm sure there will be differing opinions, but that's the way it is here.
If you are happy with the engine, and can get it to start and run reliably, then go with it. You will save some money. If you are the least bit hesitant, then perhaps a good reliable two stroke is in order for a while. Then you can always switch over to the four stroke later on. Engines never go to waste in this hobby.
CGr
I agree, I believe he should start with a 2-stroke until he becomes more educated in the 4-stroke. I have 4-strokes and 2-strokes I still use today. I started with the 2-stroke then started using the 4-strokes after I was in the hobby for a while. Eventually I'll use gas, but right now I'm OK with the glow engines I have. If he's a member of a club, ( I hope he is) I believe he should buddy up with someone in the club that uses 4-strokes, and I'm sure they will give him a hand in what he needs to do, and what needs to be done in breaking the engine in and how to properly adjust the valves etc.
Pete