[Masteryota]

The 200sx is peppy'er than the 200s engine, due to the higher compression with the electric start. Spec on mine is 13hp/11ft.lb. torque, and thinking bumping the CR from 7.6:1 to ~9.5:1 with the 200x piston kit, I'm guestimating around 15hp. I worry about the clutch a bit, because of the weight, thats why I suggested a lower gear ratio.

You are right, though, about using a jackshaft which should solve your axle sprocket location issue, and losing an entire sprocket and chain should even out any added weight from the the quad engine, I am sure the 520 stock quad chain will hold up to what you throw at it. The only issue I have seen so far is trying to find 520 sprockets for the jackshaft, but I'm sure they are out there.