AndyMark will be selling these
Kit Transmission upgrade kits for Large Mini-Bike Motor. Currently, our site needs a quick repair to fix the link, but it should be up and operating soon.
Parts for this upgrade kit include:
28-tooth 20 dp gear with "D" hole for Mini-Bike Motor
New Motor Mounting Plate
Capture bar to hold motor onto plate
... and associated fasteners and hardware
Price: $28 each
Thank you,
Andy Baker