My step-dad has a 1978 Honda CB750 K-Series bike with extremely low mileage, need a good going over as it’s been sitting for the past 10 years pretty much though. Very clean for the age though, still runs last I heard but the carbs will definitely need cleaned out, as well as new tires as the OEM ones has long since dry-rotted.
Was looking for $800 last I heard, can get more info if you wa