While we will try to be helpful, this site is primarily devoted to RACING karts, instead of the offroad yard karts you’ve posted.
Based on a cursory look, and Google search, this appears to be possibly an early variation of this:
Yours is, of course, a single seater version.
It will require substantial reworking to reassemble to usable. My choice would be a GX390 or 420 engine with CVT / jackshaft and a proper aluminum racing bucket seat with 5 point harness.
Have fun, and good luck!
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