Ouch; that needs a spacer between the driven and the small sprocket. looks like the chain pins and plates are catching the driven pulley. that is also probably lifting the chain from the sprocket. From the looks of it, you want to dismantle both the drive clutch and driven, clean & lube them, wire wheel the chain and lube it before starting it up. If you type in "clean and Lube comet" you should find several threads about it that also have a link to a website that has details on where to lube them. You'll need snap ring pliers in addition to the wrenches.
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