Bike Engine Reverse Wiring

[steady eddie]

Hi everyone

I'm going to put a bike engine in my roadster (eventually) the chassis is all done, front suspension made, everything painted and going well.
I like to plan ahead so the starter motor route for a reverse will be the road to go down. So to try and make life a little easier does anyone have a wiring diagram?
Half a mild in the Rat and Vomit to the winner: