Kawasaki H2750 Mach IV

Kawasaki H2750 Mach IV
Manufacturer	Kawasaki
Production	1971
Engine	Two stroke, transverse three cylinder
Compression ratio	7.1:1
Top Speed	120 mph / 192 km/h
Ignition	CDI
Battery	12V-6AH
Transmission	5 Speed
Frame	Tubular, double cradle
Suspension	Front: Telescopic forks non adjustable Rear: Dual shocks preload adjustable
Brakes	Front: Single 295mm disc Rear: 203mm drum
Front Tire	8.25-19
Rear Tire	4.00-18
Wheelbase	1410 mm / 55.4 in
Seat Height	795 mm/ 31.25 in
Weight	192 kg / 423.2 lbs (dry),
Recommended Oil	K-tech 10W-40
Fuel Capacity	16.7 Liters / 4.4 US gal
Manuals	Service Manual

It could reach a top speed of 120 mph / 192 km/h.

Engine

The engine was a Air cooled cooled Two stroke, transverse three cylinder. The engine featured a 7.1:1 compression ratio.

Drive

Power was moderated via the Wet, multi-plate.

Chassis

It came with a 8.25-19 front tire and a 4.00-18 rear tire. Stopping was achieved via Single 295mm disc in the front and a 203mm drum in the rear. The front suspension was a Telescopic forks non adjustable while the rear was equipped with a Dual shocks preload adjustable. The H2750 Mach IV was fitted with a 16.7 Liters / 4.4 US gal fuel tank. The bike weighed just 192 kg / 423.2 lbs. The wheelbase was 1410 mm / 55.4 in long.

Photos

Overview

Kawasaki H2 750 Mach IV

Take a ride on Kawasaki's 750 H2 now, in these times of safety-consciousness and environmental awareness, and the legendary two-stroke triple would seem like a bike from another planet. Fast, loud, smoky, vibratory, thirsty and evil-handling, the H2 and its predecessor the Mach IV were outrageously anti-social even by the somewhat lax standards of the early Seventies.  Kawasaki pulled no punches in setting out to establish the snarling stroker's performance credentials. The first paragraph of their brochure read:

'The Kawasaki 750 Mach IV has only one purpose in life: to give you the most exciting and exhilarating performance. It's so quick it demands the razor-sharp reactions of an experienced rider. It's a machine you must take seriously.'  They weren't joking. The original aircooled 748cc motor put out 74bhp, which was enough to send the triple screaming to 120mph while spewing clouds of oily blue smoke from its exhausts. Light weight and a short wheelbase meant fearsome acceleration and plenty of wheelies. Awful fuel consumption - around 22mpg was common - necessitated frequent fill-ups, but the upright riding position and tingling engine vibration meant the rider was often relieved to stop. And sometimes relieved to be alive, for the triple's handling was even more notorious than its engine performance.

The Mach IV, in particular, was distinctly lively, combining a none-too-strong frame with crude suspension with the result that its chassis was all too prone to high-speed tankslappers. Add in the poor wet-weather tire and braking performance typical of the bikes of the time, and the results were frequently disastrous.  The H2, introduced a year later in 1974, was slightly more sane all round. Its motor was less smoky (and 3bhp less powerful); its chassis more stable thanks to less-steep forks and a longer wheelbase. But the H2 was still by far the nastiest, most aggressive and most outrageous bike on the street.  Racing was an obvious progression, and the Kawasaki factory triples, nicknamed 'Green Meanies,' notched plenty of wins in the mid-Seventies, notably in the hands of Mick Grant, Barry Ditchburn and Yvon Duhamel. But tightening emission controls, especially in California, spelled doom for big road-going two-strokes. The H2's reign of motorcycling terror was relatively short.

Source of review: Roland Brown

Make Model	Kawasaki H2 750 Mach IV
Year	1971
Engine Type	Two stroke, transverse three cylinder
Displacement	748 cc / 45.6 cu-in
Bore X Stroke	71 х 63 mm
Cooling System	Air cooled
Compression	7.1:1
Lubrication	Oil injection
Induction	3 x 30mm Mikuni VM30SC carburetors
Ignition	CDI
Battery	12V-6AH
Starting	Kick
Max Power	74 hp / 55.1 kW @ 6800 rpm
Max Torque	77.4 Nm / 7.9 kgf-m @ 6500 rpm
Clutch	Wet, multi-plate
Transmission	5 Speed
Final Drive	Chain
Gear Ratio	1st 12.75:1 2nd 8.64:1 3rd 6.53:1 4th 5.42:1 5th 4.76:1
Frame	Tubular, double cradle
Front Suspension	Telescopic forks non adjustable
Rear Suspension	Dual shocks preload adjustable
Front Brakes	Single 295mm disc
Rear Brakes	203mm drum
Front Tire	8.25-19
Rear Tire	4.00-18
Wheelbase	1410 mm / 55.4 in
Seat Height	795 mm/ 31.25 in
Ground Clearance	183 mm / 7.2 in.
Dry Weight	192 kg / 423.2 lbs
Fuel Capacity	16.7 Liters / 4.4 US gal
Braking 30 Mph - 0	33 ft
Braking 60 Mph - 0	111.7 ft.
Acceleration 0-30 Mph	2.9 sec.
Acceleration 0-60 Mph	5.0 sec.
Standing ¼ Mile	12.3 sec / 105 mph / 168 km/h
Top Speed	120 mph / 192 km/h