WOW! That is a truly original drive setup that with some tweaking to the variable pulley will get the job done.. I know this is waaay after the fact but I have a Honda 50cc +2 piston sitting in the top of my toolbox.. :)
Love the beginning! Simplicity is always the best way to go. Centrifugal clutch driving the rear with a realistically larger sprocket for drive-ability and some homebrewed sheetmetal. I think Briggs made a bolt on pulley for the flywheel to ease starting tasks.
Looks like the 4 stroke 3G Grubee kit. Getting it to line up and purr should be well within your grasp. They need a lil tweak here and there but are way more durable than the old roundhead 49cc 2 stroke kits.
Greetings to the whole community..
Longtime Lurker and fan finally going legit..
Going to be posting/ building up 4 different bikes as soon as I settle into my new shop out west so I have something other than a large pile of parts to look at
1st build which probably wont start till after the...