The Zephyr Zone

Hi,new here,have a zephyr 750 motor in my 650,girlfriend has a 550.Put the zephyr engine in the 650 back in 95 or so,complete with wiring loom and carbs.I decided to build an 810 last year,which ended up with more oil consumption than a small country,so put the zephyr engine back in,but now with Mikuni 34 1000J carbs and the 80's wiring.The motor is much more fun now,even with the 17/40 gearing I had for the 810.Has anyone out there done the same on a zephyr?I'd recommend it,cheers