Just looking for suggestions for a road legal bike 80-100cc, thanks in advance

Thanks for reading!:) I just bought a Yamaha Enduro, 1976 80cc 2-stroke, that seems to have been maintained by a super clumsy dood. All the screws are stripped so I want to know exactly what the problem is before pulling it apart more. Here's what I know: The spark is fine, and so is the...