If your one to spend some cash and just want the rim fixed the correct way, remove the tire and bearings find a local machine shop to spin the wheel in a lathe to cut the old sprocket off the hub then buy a new sprocket and have them machine the sprocket hole the correct size and weld it on...
I have done this but long ago. I think I just cut the tabs off the bottom of the seats plastic structure then marked the holes. Drilled and inserted metal threaded inserts into the plastic. Its not exact shape but close enough to work.
Some results may vary.black mamba jr, .20 longer rod, .20 off head surface, and steel .oo9 head gasket
No ptv clearance problems on 3 hemi duplicate engines checked with clay. I would say without any doubt a stock head would clear with a metal gasket and this combo.
Used a conduit bender on 15 doodlebugs I have built .just put the bender so the hooks up top and the open part rests on the horizontal upper mount the neck bolt goes through. Gonna need 2 adults.one to sit on the bike and guide the bars and bike from falling and bars from twisting inward..
On a stock carb I can pretty much tilt the bike upside down and fuel stays in the carb. I upgraded to a vm22 and when I unload the bike out my truck gas comes pouring out. Float adjustment or nature of the Chinese beast.