i dont recommend the .75 two-strokel. 23oz is way too heavy an engine for this plane! a magnum .52 is only 13 oz. or an o.s. 46 is only 11-12 oz. even my saito .82 is 17 oz. anything more than 20 oz is too heavy an engine in my opinion. you will have tons of power but the wing loading will be too high for good flight performance.