[1] The AMA had announced that the regulations for 1972 had been changed to allow 750 cc two strokes to compete in 750cc class, leading Kawasaki to develop a race version of the road-going H2.

[6] During practice for the bikes first outing, the 1972 Daytona 200, it was found the chains and tyres had trouble handling the claimed 100 bhp of the machine.

[7] Yvon Duhamel, Gary Nixon and Paul Smart all retired from the race with chain and tyre problems.

Kawasaki had cast new outer cylinders for the H2R with exhaust ports pointing inwards towards the centreline to allow the fairing to be narrowed.

[10] The team for this year consisted of 5 permanent members, Yvon Duhamel, Art Baumann, Hurley Wilvert, Gary Nixon and Cliff Carr, plus an occasional guest rider.

[7] In the race Duhamel and Baumann fought for the lead until they crashed out, Nixon and Japanese rider Masahiro Wada's bikes both seized leaving Kawasaki out of the results.

[13] Riding H2Rs in the inaugural international 1973 FIM Formula 750 Prize, Baumann crashed whilst running second in the Imola 200 and Duhamel's bike caught fire during a pitstop for refuelling.

At the John Player International at Silverstone, Pat Mahoney finished 6th and Éric Offenstadt [es; fr; pl] 9th.

[16] Baumann crashed in practice for the 1974 season opener at Daytona, suffering concussion which put him out for the rest of the weekend.

Duhamel's bike locked up in the second heat throwing him off, leaving Wilvert on the only Kawasaki to start the race.

[13] At the 1974 John Player International Grand Prix at Silverstone, Duhamel finished second and Tony Rutter sixth on the H2R.