I had a couple of those and had friends who let me ride some of the others !  

an interesting item was the Kawa 500 H-1  ,   a buddy had an early model and it was crazy fast ... as it clutch less wheelies in 2nd , 3rd , and almost 4th.  
later another buddy had a new one ... it wouldn't even do a clutch less wheelie in 1st ...  

but they were all FUN !  

That was the prime of my youth!

I was a junior in high school and I worked as a part time mechanic at a Kawasaki dealer after school.  I got to take the Kawasaki H2 bikes out of the crate, assembled them, filled them up with fluids and got to take them on the test ride....they made a 250, 350, 500 and 750 triple - they were all a blast to ride.  Later that year we got two of the 900cc Z1 4 stroke bikes.  (It was a small town in a kinder/simpler time.....I can't imagine any dealer letting a 17 year old kid assemble and test ride new motorcycles now).

A couple years later I worked at a Suzuki dealer and got to assemble and ride all the Suzuki 3 cylinder 2 strokers.....GT380, GT550 and GT750 Water Buffalo, and I ended up buying a new Suzuki RE5 Wankel engine bike when they put a $1,000 rebate on them....I got mine brand new for $1,700!

I never was in a place where I got to experience the Yamaha or Honda bikes of that era.