Looks to me like a late 80's to early 90's Professional Utility.

It's missing the cowl, but the rest seems complete, with a bit of luck, the sticker on the air filter cap will still be there, and the number on that will narrow it down more, also, on the engine, stamped under the carby, you should find some numbers they will help too.

This is what it would have looked like:
[Linked Image]

Cheers
Ty

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