Clutch on predator 79cc

#1
Bought this mini chopper from a scrapper
Carb is broken. All sorts of wires are cut. Figured I would put a new engine on instead of messing with an old crud one.
Where can I buy a sprocket to fit the output shaft ? I'm guessing it needs some sort of clutch or it will keep going forever. Id like to keep the budget under 100 for what's left to be done so maybe I don't need a clutch :)
Thanks
 
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