BMW new 6 cylinder bike

[Ward P]

the kawasaki z1300 is the bike your thinking of and same as honda CBX 1000 both are big 6's and were the gun bike to have back then im sure the Z1300 set some impressive 1/4 mile times

and lets not forget the Benelli 6 's they made a 750 and 1000cc across the frame 6cyl.
Honda had success racing with a GP 125cc 5 cylinder that did 18,000rpm
and then a 250cc 6 cyl that revved up to 25,000rpm in the 1960s. After that the rules were changed 125s had to be singles and 250 max of twin.