From Wiki:
The first Kawasaki triple was the 500 cc H1 Mach III, introduced in late 1968.[1] The original H1 was unique for using a CDI ignition which operated through an automotive style distributor. The H1 offered a high power-to-weight ratio for the time, but had generally poor handling and weak drum brakes front and rear. It was the quickest production motorcycle at the time. When motorcycle journalists expressed some disbelief, Kawasaki suggested they take a new H1 to the drag strip. Using a regular production model with only 7 miles on it, Tony Nicosia ran the quarter mile in 12.96 seconds at 100.7 mph (162.1 km/h) for the press to witness. The official figure was 12.4 secs by Mike Wenzel - quite believable on a well run in machine. Tony Nicosia set many world records with Kawasaki triples over the following years, including some land speed records at Bonneville Salt Flats.
In 1972, the 750 cc Kawasaki H2 Mach IV was introduced and was essentially a scaled-up version of the H1 500.[2] A stock H2 was rated at 12.0 secs for the quarter mile. Updated with more power and better front disc brakes, the H2 became the undisputed king of the streets, even beating legendary muscle cars of the era such as the Plymouth Hemi Cuda. It was notoriously dangerous, being prone to up-and-over wheelies and speed wobbles. The dangerous handling characteristics arising from its mediocre frame design caused it to be nicknamed the "Widowmaker" by motorcycle enthusiasts of the 1970s.