As a general rule, the first bike to kick a sporty's butt in a stoplight to stoplight drag was one of the Kawasaki's oil burning triples. I believe that , if memory serves me right , the Kawasaki 750, the H-2, I believe, ran a good stoplight race against the sporty, winning about half of the time, but the 900 triple, (H-3?), would kill a sporty almost all of the time.
Were the Kawasaki triples 250, 500 & 750 in size, or were they 500, 750, & 900 in size?
Anyhow, the biggest of the triples would kill the sporty generally.
And BTW, I owned a '64 Triumph 650 T120R Bonneville in about 65. a '68? BSA 650 Lightning Rocket in about '69, and about a '71? 750 Norton Commando in about 73.