1 1909 Scott
Alfred Angus Scott invented the parallel twin two-stroke engine, at least in motorcycling terms, and formed a company in 1909 to put his ideas into production. The first models built bearing the Scott name were 450cc twins with two-speed gearboxes, produced at Bradford, UK. Uniquely, they were fitted with a kick-starter, with a Scott-designed radiator for the water-cooled cylinder heads. Within two years capacity had risen to 486cc, with a water-cooled cylinder block. From the beginning, the Scotts were noted for their exceptional performance, and their distinctive “yowling” exhaust note. The basic design endured long after Alfred Scott died from pneumonia in 1922, but production ceased in 1950. Despite several attempts to revive the marque, it disappeared in the early 1960s. George Silk produced a motorcycle of his own design, the Silk 700S, which used a Scott engine in a Spondon frame from 1971 to 1975, and later with their own Scott-inspired engine.
2 1920 Indian Scout
Designed by Irishman Charles Franklin, the Scout was the model that saved Indian. First seen in 1920, the 600cc v-twin mirrored Indian’s Powerplus but was smaller, lighter and more efficient, and became an instant sales success. In response to demand from police forces across US, the engine was enlarged to 750cc and sold as the Police Special. A civilian version of the 750 Scout, the Model 45, came on stream in 1928 and was sold alongside the 600cc version. The 750 was renamed the Model 101 in 1928. Franklin also designed the 1000cc Indian Chief of 1922 and the 1200cc Big Chief.
3 1921 Moto Guzzi Normale
The distinctive horizontal engine with the large external flywheel that powered the first production Moto Guzzi was itself derived from the prototype G.P. (Guzzi-Parodi) designed by Carlo Guzzi and Giorgio Parodi in 1919. The design
