I owned it from Oct 16 until 2020.Paid top money £6k It was a peach, 1977 rebuilt when the 250 cc learner laws made 250cc worthless. New rims £16 , side panels £24 pair , new tank all NOS. I joined the Kawasaki triples club led by the guy from Kawatripleparts in Wheelton. There was a very strong tiddler section with owners of 250/350& 400. The brave 400/500/750 boys like yours had there own club.
It was 100% reliable, never let me down , could easily fill two lanes of a dual carriageway with smoke after a winter sleep, really torqey more like a four stroke. Probably the bike I most regret selling.