Got 3 kits, a racing one which is still awaiting its engine, one that’s covered a hard life on my lightning and it keeps working flawlessly (7000 miles I think) that’s on a 68, no mods needed at all on that.
And just fitting another one to the 71 A65 I’m building. As ian says the late castings are much beefier and you will need to remove some aluminium for the front pulley to clear but this isn’t a lot and doesn’t effect the structure of the alternator casting.
It’s a dry clutch so don’t use any oil, you’ll find it much lighter than the standard clutch despite having 6 springs and clutch slip will be a thing of the past.
Do these kits have a 'cush drive' on the clutch Allan?
Not in the formal sense, its said that the belt adds some form of cush. To be completely honest I have not found any difference when riding compared to the standard setup.
The bearing arangement is far superior on the BNR and you don't get any issues with clutch wobble.