I can recommend 3 engines.

The OS 46AX, the Thunder Tiger Pro 46 and the Evolution 46.

All 3 engines are extremely user friendly, start easily, are powerful and are very reliable. The OS and Evolution are rear needle valve (remote needle valve ). The Thunder Tiger is a front needle valve (needle valve is angled towards the rear for safety ).

The Evolution engine is "supposed" to be broken in at the factory, however, I would still recommend breaking it in with a couple of tanks of fuel on the ground.

The choice is up to you (and your budget ). You will not go wrong with any of these engines.

Hope this helps.