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Good news and not so good news. I found all my papers and the carb is a Walbro. The TML company is no longer in business so my parts sheets may not be much good.
See http:yetmans.mb.ca/trivia/36.html
The rear drive is the problem as it needs a heavy spring to get enough bite from the knurled shaft on the tire. I used a automotive brake return spring. I also used a section of 15/16" radiator hose for grip and reduced tire wear. Once I got enough pressure on the wheel to go 25 mph the internal gear hub wouldn't shift properly. One suggestion would be to switch to a front mount where the torque pulls the drive into the tire. Another option would be to mount a clutch and belt drive.
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