I'm also building one now. Using a Magnum 52 4 stroke. I've mounted mine inverted. The throttle arm was close to the center line of the engine and that looked like it would be a hassle to run the servo cable. I took the carb off and flipped ti around, now the throttle arm is to the side of the engine. Now the throttle cable will be clear of the tank and the engine mount. Hope that helps, Mike.