Not easily. The intake venturi is flared, isn't it. That makes fitting a throttle very difficult. Plus, I don't remember anyone ever making a throttle for it. It's design and timing actually make it somewhat difficult to throttle. It's most distinctive and valued characteristic is the reason why. It was very sensitive to it's fuel delivery. When needled to give the highest 4cycle possible while flying level, when you hit the aircraft with a pitch up or down, the engine would jump into a 2cycle on it's own. That was with just a needle through a solid venturi. Think what it'd do if you managed to stick a carb, with it's variable venturi, on the sucker. It would drive you crazy trying to get the right needle setting. Plus.... the sucker really was not a solid performer if set to run a fast 2cycle, the way we run our RC engines.

If I were you, I'd trade that Fox off to a Control Liner. It was outstanding at that. It would be miserable as a throttled RC engine.

It was designed to run on fuel with 5% nitro and 25% pure castor oil. And it is one engine that is easily ruined if not fed what it was designed for.