did you check the middle pipe was hot?, it could have had the 'cornish mechanics' fix to the seizing middle pot problem by removing the centre conrod and associated gubbins, thats what my bro' in law's older brother did with his, after expensive damage he got the grinder out and turned it into a 500cc twin!,
Eat your heart out Mr Milliard.
Anyway, the honda 750 k's are my fave jap multis and have owned a few but they attracted thieves so gave up on them, thinking about a u.s import project if one comes along.