Gd'ay folks,
Hi Tortise always interested in getting /modifying anything to get things working again, I like the Suzy motor but the Mikuni on these is a dud.
Oddly enough, I'd say that the reason this carby was a major failure point on these engines, was that it was too high-tech for its application!
Near motorcycle level design technology , with too many small diameter fuel galleries, which are prone to blocking by fuel gum formation.