Tom,
I've been working on it, along with a gazillion other things
When I first started looking at building up a Schwinn Spoiler, I wanted to retain all of the original functionality and looks of the bike.
Kawasaki asked if I could do a belt drive set-up with the Chinese in-frame 2-stroke. It was a perfect solution to a number of problems. With the disc brake there is very little room in the rear for a drive...The belt set-up is perfect.
I'm going to use an SRAM internal 3-speed hub as a transmission that will be mounted just behind the seat post. This set-up will freewheel with the engine off, so that the bike can be easily pedaled when necessary.
I couldn't find any commercially available cogs that could be used without a lot of modification, so I bought lengths of hobbed material to make my own cogs. Notice that the smallest diameter bar is a different color. It is steel for the engine cog.
Pics:
1) Shop photo
2) Cog Material, an assortment of timing belts, cog to hub adapters, and some other bits we make here at the shop.
3) Cog adapter fresh off the CNC, and a custom made Cog ready for the rear wheel.
4) Adapter and Cog mounted. Everything cleared perfect so that the rear disc brake did not have to be modified or cobbled up in any way.
5) Belt and a mock-up of the SRAM and custom bracket. I wire tied it to the frame just to get some measurements.
Jim