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In 2004, riding the prototype KTM 250-SXF four stroke, Townley won the MX2 World Championship over teammates future champ Antonio Cairoli and teammates Tyla Rattray and Marc DeReuver.
The Verner 133M, often called the VM 133M, is a Czech two cylinder, horizontally-opposed, four stroke aircraft engine, designed and built by Verner Motor of Šumperk.
Born and raised in Cornwall, England, Barnes opened with a course record 70 to take a four stroke lead as the course was dry and fast.
Morgan won the four-stroke class at the US Open of Supercross that fall, the first win for the Honda CRF450R.
He went on to become famous for his frame designs for the large Japanese motorcycle engines of the 1970s, especially the Honda CB750 Four and the first big four-stroke motorcycles of Kawasaki.
In contrast to the RC142, the aircooled, four-stroke, twin cylinder engine of the RC143 was canted forward by 35° to improve cooling and increase air-flow to the newly designed Keihin carburettors.
After Auto Union was purchased in 1964 by the Volkswagenwerk AG, the old brand Audi was introduced again together with the new four stroke vehicle Audi F103.
In speedway racing, dirt track racing and ice racing where four-stroke engines were still at an advantage, the firm remained a dominant force.
An engine capable of switching between two-stroke and four-stroke cycles is the result of a collaboration between Ricardo, Denso, Jaguar Land-Rover and the Centre for Automotive Engineering at the University of Brighton.
When it was decided to develop a new Saab model in 1964, the Saab 99, the decision was also made to give it a modern four-stroke engine.