Eventually the sprocket is going to spin on the shaft. The engine you have uses a splined sprocket, but from looking at your pics of each engine a sprocket over the splines won't line up with your axle sprocket so some fabbing will have to be done or the easiest way but most expense will be to use an external reverse box. You can add an external rev. box cost about $200.00 plus maybe $20.00 for needed brackets. This should give you the proper line up of the 2 sprockets plus fwd. gear you can always add the shifter and cable at a later date if reverse is desired. As far as the smoke is concerned, sounds like you smoked the stator (charging system). Give me a call on Tuesday 662-301-1563 and we can discuss your options. Where are you located? and what was wrong with the old engine?
TOM
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