I usually recommend a plain bearing engine for a beginner mainly because they aren't as knowledgeable and careful in taking care of an engine as an experienced flier.

Rather than the OS LA series, I prefer the Thunder Tiger plain bearing engines. The TT .61GP is an excellent engine and is very popular in my club. It is inexpensive, has plenty of power, its air-bleed carb adjusts easily and it seems to keep on running for years. I have one I use off and on and I have forgotten when I bought it.

With a 12-6 prop it is a great combination with any 60 size trainer.