Universal Japanese motorcycle

The Honda CB750, a classic UJM

The basic platform was an upright, open seating position motorcycle powered by a carbureted, air-cooled engine wrapped in a steel-tube cradle-type frame, and at least one disc brake to bring it all to a stop. The simple design made motorcycling accessible to riders of all types and skill sets. UJMs were available in various displacements, and their ubiquity helped grow motorcycling in America during the 1970s and ‘80s.

Source: Motorcycle.com [1]

The term "Universal Japanese Motorcycle", or UJM, was coined in the mid-1970s by Cycle Magazine to describe a proliferation of similar Japanese standard motorcycles that became commonplace following Honda's 1969 introduction of its successful CB750 — which became a rough template for subsequent designs from all three of the other major Japanese motorcycle manufacturers.[2][3] In 2011, the New York Times said lightning struck for Honda "with the 1969 CB 750, whose use of an inline 4-cylinder engine came to define the Universal Japanese Motorcycle."[4]

The UJM template featured a four-cylinder engine, standard riding position, carburetor for each cylinder, unit construction engine, disc front brake, conventional tubular cradle frame and telescopic front forks and twin-shock rear suspension. As the major Japanese motorcycle manufacturers, Honda, Kawasaki, Suzuki, and Yamaha, began replicating each other's designs, the UJM's created a homogeneity of form, function and quality. UJMs included such prominent models as the Honda CB500, the Kawasaki Z1, and the Suzuki GS750. Such machines had massive sales, and UJMs continued to be produced for more than a decade.

In 1976, Cycle described the new phenomenon, saying:

"In the hard world of commerce, achievers get imitated and the imitators get imitated. There is developing, after all, a kind of Universal Japanese Motorcycle.... conceived in sameness, executed with precision, and produced by the thousands." [5]

In the 2010 book, Sport Bikes, Hans Hetrick wrote that "throughout the 1970s, the Japanese companies experimented with different types of engines and frame designs. Their ideas soon came together in a rock-solid package. This design became known as the Universal Japanese Motorcycle, or UJM."[6]

Subsequently, in the 1980s and 1990s, the Japanese manufacturers diversified their ranges, producing faired sportsbikes, race-replicas, dual-sport bikes and musclebikes.[7]

Contemporary UJM's

A market revival has led Japanese manufacturers to introduce modern interpretations of the UJM, including Honda's 2010 CB1100.[8][9]

When Suzuki introduced its TU250X in 2009 to the US market, author Pete Brissette of Motorcycle.com wrote that Suzuki had "returned to the simple formula of the UJM, and with it brought back the pleasures of riding a friendly, straightforward motorcycle."[10]

Yamaha subsequently reintroduced their SR400 to the North American and Australian market.

Notes

  1. ↑ "2009 Suzuki TU250X Review". Motorcycle.com, Pete Brissette, Oct. 06, 2009. Retrieved 2010-01-08.
  2. ↑ Frank, Aaron (2003), Honda Motorcycles, MotorBooks/MBI Publishing Company, p. 92, ISBN 0-7603-1077-7, retrieved 2010-02-20
  3. ↑ Walker, Mick (2006), Motorcycle: Evolution, Design, Passion, JHU Press, p. 150, ISBN 0-8018-8530-2
  4. ↑ "You Meet the Nicest Sportbikes in the 250cc Neighborhood". The New York Times, May 27 2011, Dexter Ford.
  5. ↑ "Honda Nighthawk 700S". Cycle Magazine.
  6. ↑ "Sport Bikes (Full Throttle), Hans Hetrick, p. 12". Edge Books, Capstone Press 2010, ISBN 1429647515.
  7. ↑ Maher, Kevin; Greisler, Ben (1998), Chilton's Motorcycle Handbook, Haynes North America, pp. 2.2–2.18, ISBN 0-8019-9099-8
  8. ↑ Motor Cycle News , 18 Jul 2012
  9. ↑ http://thekneeslider.com/honda-brings-back-the-past-with-the-2013-cb1100-a-cb750-all-grown-up
  10. ↑ "2009 Suzuki TU250X Review". Motorcycle.com, Pete Brissette Oct. 06, 2009.