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#3
shouldn't that bike have a jack shaft?

Can't see how the chain will stay on with that much room between the pivot and the sprockets.
I believe the swingarm is mounted in what should be the jackshaft mount, the gallery photos show one with the swingarm mounted up higher but not with any provisions for a jackshaft. People screw up minibikes and minicycles over the years, it has always bugged me as to why and where all the parts go.
 
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