The example bike you posted up looks like it has some sort of gear reduction.
Can you fix that with gearing???


Victa motor should work well.

You can machine the fan off the flyweel. Ditch the points and use a power torque module with the internal coil.

Not sure what the go is with the carb, do away with the govenor vane and......................... Someone else on here just did something but with a modified Briggs shaft or something.


Should be a fun project.


Cheers, Bob.