We have mounted 4 strokes on every chassis out there, the OTK racer included, 2005 model. Remove the strut, bolt one on, if you want to use it for 2 stroke guess what you have a bolt on strut instead of a welded on strut, the engine will never know. As far as 3/4 in overhang we have ran this same engine 4 years going into our 5th, it overhangs the mount 3/4″ plus, Briggs gave information not a warning. These engines are mounted on cadet chassis here at our club probably a dozen or so, it can be done.