You will have to be a whole lot more specific to find the answer that suits you, and the question as it is now is a bit like asking ' will unleaded fuel suit my car?'

There are a million variables to be answered before any meaningful conclusion can be reached.

4 strokes in control line work very well but at the moment are competition winners (or can be close to it) in stunt and scale.

Why? Because they are generally heavy, trickier to start and have a milder power output than equivalent control line engines.

The strong point is the milder power output that suits stunt and scale very well and the most popular 4 stroke in Australian CL is Saito due to its relative simplicity.

So what specific application do you have in mind mate?