upright motor? not leaning over on it's side? anyway, look at the top of the head. 2 hoses out the back and 1 hose out the front that goes to exhaust-it is a 720. 2 hoses out the back and a little weep hose sticking straight up on the front-it is a 650. if motor is leaning over and intake and exhaust are on same side-it is a 787-780-800-whatever it is called.