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Unusual, interesting & rare motorcycles.

  • Onderwerp starter Onderwerp starter Han S
  • Startdatum Startdatum
The Yamaha GL750 was an advanced prototype motorcycle introduced at the 1972 Tokyo Motor Show, showcasing Yamaha’s ambition to compete in the high-performance motorcycle market of the early 1970s. The bike featured a unique 750cc two-stroke, four-cylinder, liquid-cooled engine, which was an advanced concept at the time. Its inline-four configuration promised impressive power output, expected to rival top competitors like the Kawasaki H2 750 and Suzuki GT750. The GL750’s design included modern features such as disc brakes highlighting Yamaha's focus on performance and cutting-edge technology. The bike was also a response to the growing demand for more powerful and capable machines in the 750cc class, appealing to riders seeking speed and innovation.
Despite the excitement surrounding its unveiling, the Yamaha GL750 never went into production. One of the primary reasons was the industry's shift away from two-stroke engines due to evolving environmental regulations and the rising preference for four-stroke engines. Yamaha pivoted towards developing cleaner, more efficient four-stroke engines to comply with new emissions standards, leaving the GL750 as a missed opportunity. Although the GL750 never saw the road, it remains a fascinating piece of Yamaha’s history, remembered for its technological innovations and for what it could have contributed to the era's high-performance motorcycle market.


 
Kawasaki 750 Square Four.
The 'Square Four' engine layout wasn't revolutionary (Ariel’s 4-stroke Square Four was launched in 1931 and continued in production until 1959), and was intended to offer a balance of compact size and smooth power delivery, combining the benefits of multi-cylinder performance with reduced vibration compared to an inline-four design.
Judging by these pictures it seems to have been a viable running machine, though as with the Yamaha GL750 it sadly never made it into production, coming as it did at same time as Kawasaki's more conventional (and commercially successful) machines such as the Z1.


 




De Norton Manx, een legendarische racer welke begon eind jaren 30 en tot in de jaren 70 succes had.

500cc eencilinder met twee bovenliggende nokkenassen en open klepveren, dus oliedicht kon je vergeten.

Vermogen rond 50 pk en dus 10 pk per 100cc. Een 50 cc racertje uit je jaren 70 zat tegen de 20 pk.
 
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