ive had people here tell me i can"t use the one with the kit,if you got yours to work thats great! that will save me 60 bucks!
All I did was re-drill new holes in the sprocket and hub and added nuts and bolts with lock washers. Not much space so you have to drill correctly or you are screwed.
I also used some Grade8 M5 bolts and nut's. The center of the sprocket should rest against the lip on the hub, which will keep the sprocket out far enough to clear the tire with the chain and line up the rear sprocket and drive sprocket on the motor. I also used small spacers on each of the bolts that bolt the sprocket to the hub. With the sprocket against the lip of the hub there is a gap between the sprocket and hub.
Although I really doubt a spacer between the hub and sprocket are really needed but this was for a customer so I added a small spacer that fit each bolt so there was no space between the hub and sprocket. This will also help just in case the lip on the hub wears down the sprocket will stay aligned.
I did find two pics before my camera died, sorry no close-up of sprocket. Ignore the exhaust that was before we had one made for it, this was when we were just testing it out. Alex is my Motorized Bicycle builder partner, he is the one test riding the chopper.