Tag Archives: United States

Speed King

For enthusiasts of Land Speed Record breaking, the title “Speed Ace” or “Speed King” conjures images of such archetypal heroes as Segrave, Campbell and Cobb, frantically sawing at the wheel of some aero-engined behemoth as it thunders down the beaches of Daytona or along the dazzling white salt flats of Bonneville. English gentlemen who would risk life or limb for King and Country and the prestige of Britain.

But record-breaking often creates less likely heroes who would arguably qualify for the same distinguished mantle.  Don Vesco was one such person, who not only set an outright World Land Speed Record for motorcycles of 318.598mph (512.73kph), but also an outright World Land Speed Record for a wheel-driven vehicle of 458.440mph (737.787kph).

Don Vesco.

Don Vesco.Record-breaking was only one part of a lifetime chasing speed.

Record-breaking for Vesco though was only one part of a lifetime chasing speed.

Don was born in Loma Linda Southern California on April the 8th 1939, in an environment that not surprisingly nurtured a “need for speed”.  His father, John Vesco, ran hot-rods and streamliners out of his body shop on Southern California’s numerous dry lakebeds – a perfect setting for Don and his two younger brothers Rick and Chuck to gain an education in all things fast.

Vesco was mechanically gifted as a child, and while still in his teens, modified a rigid framed Triumph 500cc T100R twin to enter his first official race, a local drag race meet at San Diego’s Paradise Mesa drag strip. What followed was that unique blend of American motorcycle racing, on bitumen, dirt track and TT steeplechase. One of Don’s old Hoover High School buddies and main rival on the track in those days was a future legend, Cal Rayborn.

It was in the discipline of road racing that Vesco excelled and it soon became apparent that the Triumph was no match for the Manx Norton’s many of his rivals were racing.  Thanks to a loan from his girlfriend Norma, who would become the first of his three wives, Don was able to purchase a Manx.  The combination proved almost unbeatable in local road races at tracks like Willow Springs and Riverside in the late 1950’s and early 1960’s – at a time when Japanese manufacturer Honda was trying to take a foothold in the lucrative American motorcycle market.

Don on the salt at Bonneville with his Manx Norton.

Don on the salt at Bonneville with his Manx Norton.

Honda hired Vesco to race its highly successful RC161 four-cylinder four-stroke 250cc Grand Prix racer in American events to help promote the brand. Don duly notched up two wins on the RC161 first time up at the Goleta Airport track in Santa Barbara but crashed the bike several months later at the same venue.  When a promised ride in the 1962 US Grand Prix at Daytona (an FIM sanctioned international event) was given to Japanese rider Kunimitsu Takahashi, it appeared that Don was out of favour.

In a twist of fate another Japanese manufacturer, Yamaha was also trying to promote their motorcycles in America. Yamaha contacted Vesco to race its RD56 250cc two-stroke Grand Prix racer the following year in the open class at the same event. The race, however, wasn’t to be all smooth sailing. Vesco, suffered a fall in the Daytona infield, but remounted and went on to lap the entire field to win the 1963 US Grand Prix, giving the Japanese manufacturer their first major victory in America. Vesco was to ride again for Yamaha at Daytona in 1964, and this time the Grand Prix was a fully sanctioned round of the FIM 250cc World Championship.  Unfortunately, a nasty fall in practice resulted in a broken collarbone for Vesco, and the GP racer was handed to up and coming English rider, and future World  Champion, Phil Read. The bad luck continued for Yamaha and the bike seized during the race.

Don aboard the Open Class winning Yamaha RD56 at Daytona 1963 with Japanese rider Fumio Ito.

Yamaha was now offering Don a dealership, which initially he declined, but reconsidered when his employer complained he had too much time off through racing accidents. He opened shop in El Cajon California in 1966.

By the early 70’s Vesco had two of the world’s best racers riding out of his dealership, former world 250cc Grand Prix champion, Australian Kel Carruthers (who had come to live and race in the U.S. at Don’s invitation), and his old racing buddy and rival Cal Rayborn.   By the late 70’s other such greats as Gene Romero, Dave Aldana, Ron Pierce and Yvon du Hamel had all ridden under the Team Vesco Yamaha banner.

Don had by now shelved his own racing ambitions to concentrate on the dealership with the satisfaction of having been a factory rider for a number of manufacturers including Honda, Yamaha, Bridgestone and BSA.

Don on the cover of the Orange County Raceway program riding a 250cc Bridgestone GP racer.

It was during this period that Vesco began his highly successful motorcycle land speed record runs at Bonneville Salt Flats. Don was no stranger to the salt having first run a motorcycle at Bonneville at the age of 16, and in 1963 joined the exclusive 200mph (321.87kph) club, driving his fathers Offenhauser powered four-wheeled streamliner #444 to 221mph (355.67kph).

However, it was the outright Motorcycle Land Speed records that Vesco became synonymous with. The first was in September 1970 using a twin-engine streamliner fitted with Yamaha R3 air-cooled 350cc two-stroke engines to set a new world record of 251.924mph (405.43kph), becoming the first man to break the 250mph barrier.  It was short lived though, as less than a month later Harley-Davidson broke his record with Cal Rayborn at the controls. Vesco knew of his friend’s record attempt and made sure he received his contingency money from Yamaha and his other sponsors quick smart!

Vesco and Big Red the first motorcycle to achieve over 250mph.

Vesco and Big Red the first motorcycle to achieve over 250mph.

Five years later Don returned to the salt and was the first to crack the 300mph barrier and set a new record in the Silver Bird Yamaha, (a stretched version of his old streamliner Big Red, fitted initially with two TZ700cc two-stroke Yamaha racing engines), leaving the mark at 302.928mph (487.53kph).

This was not enough for Vesco, and in August 1978 he established a new outright world record of 318.598mph (512.73kph) with Lightning Bolt using two modified 1015cc turbocharged Kawasaki KZ900 engines.  Remarkably this outright world record stood for 12 years.

But it was only two months later that success turned to failure when Don took Lightning Bolt to El Mirage dry lake and crashed.  Vesco escaped without injury, but much of the streamliner’s bodywork was damaged.  By 1980 Don had finished work on a new streamliner using two turbocharged 1300c six cylinder Kawasaki engines, although success eluded his latest creation.

Don with the Silver Bird Yamaha streamliner after setting an new world record of 302.98mph.

Don with the Silver Bird Yamaha streamliner after setting a new world record of 302.98mph.

Vesco now started to eye the record for wheel-driven automobiles and in 1982 returned to Bonneville with a unique machine called Sky Tracker. Built along the lines of Don’s motorcycle streamliners, Sky Tracker used the driver’s compartment from Lightning Bolt and sported five wheels, two next to each other at the rear, one on each side and enclosed in the middle of the bodywork, and one at the front.

Rain, in both 1982 and 1983, thwarted attempts with Sky Tracker at Bonneville, although a speed of 235mph (378kph) was achieved in 1984 using a turbocharged Drake-Offenhauser engine before the meet was rained out again.  1985 saw Vesco qualify Sky Tracker for the World Finals record runs with a pass of 318mph, (512kph) his unusual creation starting to show its potential. Like anybody involved in the pursuit of speed, Vesco was well aware of the dangers, but a blown rear tyre at 350mph (563kph) underlined that point in no small way.  Sky Tracker crashed end over end five times utterly destroying the car. Don came away with damaged vertebrae, concussion and a broken bone in his hand and right foot.

Don with the Kawasaki Lightning Bolt. His record stood for 12 years.

Don Vesco with the Kawasaki Lightning Bolt. His record stood for 12 years.

Finding enough money to continue chasing the record was not unfamiliar territory for Don and his brother Rick who was also working on a parallel project. It made sense to join forces to complete a new twin-engine car, although it was not until 1991 with a pair of turbocharged 160 cubic inch Drake-Offenhauser power units that it started to show promise with a run of 372mph (598kph).   Expensive engine failures were now becoming a problem, and it was apparent to the brothers that piston engine power was reaching its upper limits. A different power source was needed if they were to break Al Teague’s wheel-driven record of 409.97mph (659.78kph).

A gas turbine was seen as the best solution, and a compact helicopter unit could be found comparatively cheaply in the form of an Avco Lycoming T55-L-11A SA. The streamliner now became known as the Turbinator with its engine producing 3,750hp at 16,000rpm, driving all four wheels through a gearbox bolted to the front with a reduction ratio on the shaft of 2:1.

Turbinator.

Turbinator.

The first development runs took place in 1996 at Bonneville, and over the next four years, Don and Team Vesco set three national records at the World Finals in excess of 400mph (643.74kph), culminating a one-way run of 427mph (687.19kph) in 2000. The world record slipped through their grasp that day when a gearbox failure with Turbinator prevented the team turning the car around for the return run within the one hour stipulated by FIA regulations.

Team Vesco returned to Bonneville once again in 2001 for the World Finals, with 500mph squarely in their sights.  The team were buoyed by the fact that in a one-way “shakedown” run Turbinator reached 470.28mph (756.84kph) and was still accelerating out of the measured mile. The record runs however produced a real problem.  Don was unable to hold open the throttle as the engine temperature at the burners kept creeping up dramatically and could have caused the engine to self-destruct. Vesco had to modulate the throttle 16 times to contain the temperature but still hit over 458.mph (737.08kph) on the first run. The problem was the reduction gearbox, bolted to the shaft on the front of the engine, prevented enough cooling air to flow into the turbine.

The return run was going to be challenging, and again Vesco was required to modulate the throttle 18 times to contain engine temperature. Worse was yet to come as the rear left tyre blew inside the measured mile. It took all of Don’s skill and experience to keep the Turbinator on track and slow it down, stopping a mere 15 feet inside the black line.

Team Vesco had done the job; the return run had equalled the first to give a two-way average of 458.44mph (737.79kph).

Don and the team were happy to have beaten Al Teague’s 1991 wheel driven record of 409.986mph (659.81kph) in Spirit of ‘76. But more delighted to have broken the record for a gas turbine automobile of 403.10mph (648.73kph) set 37 years earlier in 1964 by Donald Campbell at Lake Eyre in South Australia driving CN7 Bluebird.

Don and Team Vesco break the wheel-driven Land Speed Record 2001.

Don and Team Vesco break the wheel-driven Land Speed Record 2001.

In 1999 the American Motorcyclist Association had honoured Vesco’s achievements and inducted him into their Hall of Fame. Don turned 60 that year.  If there is one thing, that old motorcycle racers know from experience, crashing and riding injured come with the territory. Vesco had suffered his share, but in 1995 while spectating at a sprint car meeting at the Manzanita Speedway in Phoenix Arizona, Don was struck in the left eye and permanently blinded by a piece of debris thrown up by the rear tyre of a sprint car. Driving Turbinator with one eye was just another obstacle for Don to overcome, which makes those 400mph (643.74kph)  plus runs all that more remarkable. It didn’t deter Vesco from competing at Daytona in the BMW legends series, riding an R1100RS as fast as ever, and he continued to compete in AHRMA events on one of Team Obsolete’s Manx Nortons.

Unfortunately, there was one final obstacle Don was unable to overcome before he could achieve his dream of 500mph (804.67kph). He was diagnosed with prostate cancer and succumbed to the illness on the 16th of December 2002 aged 63.  Vesco was inducted posthumously into the Motorsports Hall of Fame of America in 2004.  Today, after 13 years, Don’s record still stands, but Team Vesco will continue to work towards that dream of 500mph (804.67kph) and will be back at Bonneville with an upgraded and improved Turbinator 11.

Don Vesco, factory motorcycle racer, team owner, engine tuner, designer, Land Speed Record Breaker. Speed King.

Words Geoff Dawes (C) 2013. Images http://www.bluebird-electric.com, http://www.bikernet.com, http://www.gregwapling.com, http://www.forumboxerworks.com, http://www.yamahapart.com, http://www.eliteday.com, http://www.global.yamaha-motor.com and http://www.croinfo.net.

Archives: Kawasaki Z1 Super 4

The Z1 had a majestic presence

When Honda unveiled the CB750 at the Tokyo Motor Show in 1968, it immediately captured the imagination of the motorcycling public.  It would become the first mass-produced, large capacity, across the frame, O.H.C. four-cylinder motorcycle.  And it also boasted another motorcycling first, a front disc brake.  But just as importantly, it would be affordable for the general public to buy.

The CB750 was a technological tour de force that set a new benchmark for the other manufacturers to match.  When it hit the showroom floor a year later, it set a precedent in large capacity motorcycle design that has lasted to this day.

But if the Honda “four” captured the public’s imagination, then the Kawasaki Z1 super4 stole it.

Conceived in 1967 after intensive research by Japanese-American Sam Tanegashima into the needs of the world’s most important motorcycle market, the United States, Kawasaki set its design parameters for a new large capacity motorcycle.  Its heart was to be a compact D.O.H.C. 750cc four-cylinder engine that placed emphasis on lower exhaust emissions and running noise.  The project had reached wooden mock-up stage by September of 1968 only to be still-born when Honda revealed the similar in concept CB750.  But although this blow initially shelved the project, code-named “New York Steak”, it also proved useful to Kawasaki.  They could now gauge market reaction to the big Honda, and in 1969 another intensive survey of the U.S. was undertaken.

Z1 final mockup courtesy Kawasaki Australia

Later that year the final decision was made.  The small team involved in the project, Mr Inamura and Mr Togashi, (chief engineers for the engine and chassis) and Mr Tada, (chief designer) were told “New York Steak” would go ahead.  But Kawasaki’s re-evaluation had concluded that the engine capacity should be 900cc.  This created a new niche in the large capacity motorcycle market, and Kawasaki would regain the mantle, formerly held by its W series 650cc twin, as the largest capacity motorcycle on offer from Japan.

The real challenge for the engineering and design team, however, was to meet Kawasaki’s ultimatum to have the new bike ready for final testing within 24 months.  Although a lot of groundwork had already been done, with over $800,000 invested in development costs for the 750cc version, the timetable was still a tough one.

In the Japanese spring of 1970 the first prototype hit the demanding Yatabe test course, and in the hands of its American test rider lapped at an incredible average speed of 200kph.  There were problems though, the crankcase breather system let oil out instead of keeping it in, and piston crowns succumbed to the intense heat of combustion.  But the issues were rectified, and rewarded, with one prototype recording 95bhp and a top speed run of 225kph.

Z1 final prototype (curtesy Kawasaki Australia)

Z1 final prototype (courtesy Kawasaki Australia)

In January 1972 pre-productions models were shipped to Los Angeles for testing on public roads.  On a round trip to Daytona in Florida, they covered over 20,000km which included endurance testing on road race circuits.  Apart from some minor chain and tyre problems, they proved the reliability of Kawasaki’s design.  Not content with this, Kawasaki returned to the States three months later for more extensive tests.   The results even surpassed Kawasaki’s own expectations.

It was time to go public, and in June 1972 the worlds motorcycle press were invited to Japan by Kawasaki.  The Z1 super4 was officially announced and opinions of the motorcycle, both good and bad, were eagerly sought – if Kawasaki were to beat Honda at their own game everything had to be right.  By August the production lines were readied, now it was up to the marketing men.

Press release from Mr. Yamada (courtesy Kawasaki Australia)

Press release from Mr Yamada (courtesy Kawasaki Australia)

In September 1972 the Z1 was launched at the Cologne Motor Show while in Japan the production lines started to roll, building a conservative 1500 units per month. The Kawasaki design team held their collective breath while they waited to gauge market reaction to the new model.  There was no need to worry, the Z1 super4 took the show by storm, as it did the other European shows that followed.  By 1975 Kawasaki would be building 5000 units per month.

It was the demands of the tough American market that had fathered the Z1, and something special was in store to underline the muscle-bound roadsters capabilities.  In March 1973 a team of riders, mechanics and officials, arrived at Daytona Motor Speedway.  Their aim, to set new speed and endurance records for a production motorcycle.  Three days later they had established 46 F.I.M. and A.M.A. records including a new 24-hour record for a production motorcycle of 176.412km/h.

Paul Cawthorne on the Bolton's Z1

Paul Cawthorne on the Bolton’s Kawasaki Z1.

Later that year, at its first attempt, the Kawasaki Z1 came second, fourth and fifth in the gruelling Bol d’Or 24 hour endurance race, while in Australia, after an epic solo ride, Kenny Blake won the prestigious Castrol Six-Hour production race.  The opening chapter of a legend had been written.

Z1 Technical File

“You can design the most beautiful motorcycle in the world, but if it doesn’t have the right engine, there’s no way you can make a complete package.  Therefore, in all our bike development, the first consideration is the engine.” – Mr Inamura Chief Engineer Four-Stroke Engines, responsible for the Z1.

In the four years before the launch of the Z1, the Honda CB750 had established itself as the yardstick that other large capacity “sports tourers” were judged by.  But although the contemporary Honda engine set the trend for an across-the-frame four, the technical specification between it and the Z1 was poles apart.

The CB750 boasted a single overhead camshaft with the valves actuated by rocker arms and adjusted by screw and lock nut.  It had a bore and stroke of 61mm x 63mm with two-piece connecting rods that bolted together on a forged one-piece crankshaft which was supported by five plain main bearings.  The primary drive was by dual sprockets and two single row chains, while the engine oil was supplied from a separate oil tank mounted under the frames side cover to a “dry” sump.  It produced a maximum of 67bhp at 8,000rpm and 6.1kg-m of torque at 7,000rpm.

Bullet proof.

Bullet-proof.

The Z1, on the other hand, featured twin overhead camshafts that operated directly onto the valve via a “bucket” which used different thickness metal shims located on the top of it to adjust valve clearance.  It had a “square” bore and stroke of 66mm x 66mm, while the crankshaft was a pressed up five-piece unit that allowed the use of one-piece connecting rods.  The crankshaft was supported by six caged roller main bearings that required only low oil pressure to spin freely.  The lubrication system was by wet sump, while the primary drive used a straight cut gear on the crankshaft web and turned directly on the clutch.  The Z1 produced a whopping 82bhp at 8,500rpm and 7.5kg-m at 7000rpm.  It was also a very compact design – over 7.6cm narrower than the Honda.

Both engines were sound designs and relatively under-stressed, and both responded well to tuning, but it was the D.O.H.C. design of the big Kawasaki that had the edge.  During Kawasaki’s record-breaking blitz at Daytona, a stock Z1 with slightly modified camshafts and cylinder head, different carburettors and a four into one exhaust system, produced 105bhp at 10,500rpm.  French Canadian road racer, Yvonne Du Hamel, used this bike (fitted with full fairing, race seat, clip-ons and slicks) to set a new closed course flying one lap record of 257.9km/h.  Its top speed on the straight was 280km/h!

Factory dynometer readings for the Z1 9courtesy Kawasaki Australia0

Factory dynometer readings for the Z1 (courtesy Kawasaki Australia)

But the outright performance was not the only consideration that had to be made by the engine team.  The tightening pollution regulations in the US, particularly in California, required contemplation.  Mr Inamura and his group took a leaf out of the auto industries book and came up with PCV, Positive Crankcase Ventilation.  This was a means of recirculating “blow-by gasses”, mainly unburnt fuel that passes the piston rings and enters the crankcase.  These gasses can contaminate engine oil and were usually vented by a crankcase breather into the atmosphere.  The PVC valve allowed the gasses to be separated and vented from the crankcase back into the airbox to be re-burned, bringing about a claimed 40% reduction in hydrocarbon emissions.

Another feature of the engine design was hardened valve seats and phosphor bronze valve guides, which allowed the Z1 to run on unleaded fuel.  The valve guides, however, were found to wear rapidly enough for the factory to replace them in later models with iron items.

The Z1 engine quickly became the favourite of performance tuners around the world and established itself as the engine to beat.  From endurance racing to drag racing the Z1 engine proved almost unbreakable.  Perhaps the greatest form of flattery is imitation, a compliment paid by Suzuki when it introduced its first large capacity multi-cylinder four-stroke street bike with the GS range that featured an engine configuration almost identical to the Z1.

MEMORIES OF A ZED

In the early seventies, Australia was in the grip of the worldwide boom in motorcycle sales.  Two-wheeled transport became so popular that car dealers took on motorcycle franchises as a sideline to their passenger car sales.  It was into this buoyant environment that Kawasaki launched its new “super4”, and with their first shot, they hit the bullseye.

Author and his 1973 Z1A.

Author and his 1973 Z1A.

Never had a motorcycle been more anticipated in Australia than the Z1.  The American magazines were full of superlatives about the big new muscle bike before it arrived on Australian shores, and when it did, it received the same kind of acclaim from the local press.  There were some reservations about the big Kawasaki’s handling under duress, but remember, this was the most powerful production motorcycle in the world!  Not only could it cut the standing 400 metres in 12 seconds flat, but it had an amazing (for 1972) top speed of 217km/h.

Bolton’s, the South Australian distributor for Kawasaki, displayed the Z1 in the window of its Greenhill Road showroom with a sign that was in keeping with factory publicity, and boldly stated, “for experienced riders only”.  That sign did little to deter would-be purchasers, if anything, it just underlined the performance of the big Kawasaki.

It should be remembered though, that in 1972 it was not unusual for Japanese motorcycles to have some “interesting” handling traits.  Most Oriental motorcycles were fitted with home brand tyres that quickly qualified for the title “rim protectors” as they were good for little else.  Japanese suspension manufacturers had yet to master the art of effective compression and rebound damping, especially on the new breed of heavy big bore motorcycles coming from the land of the rising sun.

IMG_0006

A superbike superstar.

All of the above though was pretty academic.  It was the outright performance of these new machines that were all important and the engine technology that provided it.  Plus a build quality, finish and reliability that made the minuses much easier to live with. And there was nothing quite like the sound of a Honda CB750 with all four baffles out, that is until the Z1 came along…

The big Kawasaki exasperated problems with the chassis technology of the day, simply because it was heavy (209kg dry) and so powerful.  It should be noted that even the European tyre manufacturers were not prepared for the Z1 and it soon started a race to produce more suitable rubber.  English tyre manufacturer, Avon, was one of the first with their “Roadrunner” range and quickly developed a presence in production racing, which was by then dominated by the Z1.

For the average owner to improve a Z1, it merely meant replacing the standard rubber for a set of Avon’s, trading the original shocks for some Koni’s, plus experimenting with different front fork oil. Fitting an adjustable Kawasaki steering damper also helped.  All the above made an improvement and it was possible to use up more of the Kawasaki’s good ground clearance during a Sunday blast.  But somewhere along the way, the Z1 would always remind you that it was still one big heavy motorcycle.

Kawasaki’s publicity called the Z1 super4 a super sports tourer, and it was ably suited to that role.  With two-up and luggage onboard the bike could eat up the miles effortlessly, with 4500rpm in top equating to 110km/h and returning around 6 litres per 100km fuel consumption.  The Z1 did suffer some shortcomings – the standard handlebars were too high and wide, making the rider a wind sock at speed.  At cruising speeds secondary engine vibration could be felt, although on its own it was not really a problem, but combined with the hard plastic hand-grips, it became hand numbing after a while.  Also, the seat was too narrow at the front and a bit too firm over long distances.

Another gripe was the front disk brake.  It had a high content of the stainless steel, which prevented it from rusting – unfortunately when it rained and the brakes were applied nothing much happened!  A makeshift solution was to drill holes in the disk which helped dissipate the water more quickly.  It was a problem that sent Kawasaki on a search for better brake pad material and is responsible for the superior sintered metal pads we enjoy today.

Twin disk brake was an option.

Twin disk brake was an option.

General maintenance of the big Kawasaki was pretty straightforward and well within reach of the home mechanic.  A relatively inexpensive special tool was required to allow shims to be changed for valve clearance, and a set of vacuum gauges made synchronising the carburettors easier.  Unlike the CB750, Kawasaki had designed the Z1 so the cylinder head and barrels could be removed with the engine still in the frame, in fact, it was only in the rare occurrence of the crankshaft or gearbox needing attention that the engine had to be removed.

Although the Z1 was fitted with the heaviest duty chain available (630), an adjustable automatic chain oiler was fitted to help extend its life.  An oil tank under the left side cover fed a plunger type oil pump that ran off the gearbox output shaft and lubricated the chain from small holes above the gearbox sprocket.  It was fitted to the Z1-Z1A before a lower maintenance Hatta o-ring chain became standard on the Z1B.

The Z1 was a good looking machine, and it was interesting to read the policy notes of Mr Tada, chief designer of the Z1, as they sum up the appeal of the Kawasaki at the time.  They read as follows ” a: a gallant and inspiring leader of Kawasaki’s street line, b: originality in styling, to be different to any other bike on the street (anti-Honda styling), c: a better look and higher quality than those of other competitive machines”.

The Z1 had a majestic presence about it and some good detail design innovations.  The faired automotive type mirrors were a  first, and not only looked good but functioned well.  The bullet-shaped gauges blended well with the overall styling and featured yet another first – a “dashboard” for the warning lights that also incorporated the ignition switch.  Pretty hot stuff in 1972.  Also, the reflectors fitted to the front fork and rear shockers were not just for style – side on visibility of motorcycles at night was of some concern in the United States, so reflectors were a practical response.

The Z1 incorporated a first in having the ignition an "idiot lights" between the gauges.

The Z1 incorporated a first in having the ignition and “idiot lights” between the gauges.

It may be hard to imagine now, with all the Japanese manufacturers offering ballistic big bore models as front-line weapons in the battle for street bike supremacy, but from the Z1 of 1972, through to Z900 of 1976, the Kawasaki reigned supreme as the all-round performance King of production motorcycles.  In 1967 when Japanese-American Sam Tanegashima researched the kind of large capacity motorcycle that Americans would buy, he envisioned a super cruiser, a machine that was equally at home in city traffic, or cruising lazily down country roads, to running flat out on America’s superhighways. A motorcycle that could stand proudly alongside the legendary Vincent HRD of yesteryear.  From those of us that owned a Z1, Sam, you got it right.

Words and photographs Geoff Dawes. (C) 1997. Photograph Viv Dawes (C) 1984. Published April 1998 in Two Wheels