Seeking advice on rear wheel sprocket options

[Wevil Kenevil]

Another 212cc Predator bike from VeniceMotorBikes | Motorized Bicycle Engine Kit Forum (motorbicycling.com)

THIS IS WHAT I need for this... I've been chasing this 50 mm LD100 head pos down a rabbit hole...

I know its skanky now but watch what happens when I have all the pieces to put it together.
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See