Re: Question for jackshaft guys?
my 2 cents is that if you have the $$$, then go for it... I'm using an internal gear hub so the adjustment is very minimal. But you might have to modify the rear mount to keep the chain with a correct tension. The engine has a tendency to twist downwards to the right, so install that little angle aluminum bar, to minimize the engine movement, and chain slacking. You might need to have an extra angle aluminum bar, it can sometimes break. I have upgraded to a steel angle bar.
Starting the engine is not that difficult.
Your bottom bracket should be wider, about 127mm or longer.
It will certainly allow you to do off roading, but this depends on your sprocket size, and that your spokes, rims, brakes, and tires can handle the additional torque and power.
Regardless if it's left or wrong, the opposite is always right.
Caution: This hobby is habit forming.