List of Yamaha motorcycles explained

The following is a list of motorcycles, scooters and mopeds produced by the Yamaha Motor Company.

First and last bike

YA-1 built August 1954, produced January 1955. The first bike manufactured by Yamaha was actually a copy of the German DKW RT 125; it had an air-cooled, two-stroke, single cylinder 125 cc engine^[1]
YC-1 (1956) was the second bike manufactured by Yamaha; it was a 175 cc single cylinder two-stroke.^[1]
YD-1 (1957) Yamaha began production of its first 250 cc, two-stroke twin, the YD1.^[1]
MF-1 (1958) 50 cc, two-stroke, single cylinder, step through street bike^[1]
YDS-3 (1964) 246 cc, two-stroke, parallel-twin, it used the world's first oil injection lubrication system in a 2-stroke engine.^[2]
DT-1 (1968) Yamaha's first true off-road motorcycle.^[1]
XS-1 (1970) Yamaha's first four-stroke engine motorcycle (650 cc twin).^[3]
YZ Monocross (1975) First production motocross bike with a single rear shock.^[3]
YZ400F (1998) First mass-produced four-stroke motocross motorcycle.^[3]

Some of these step-throughs and scooters are made for Southeast Asian markets, where they are known as underbones.

Large scooters with more than 125 cc, and a large chassis and protection from the elements.

Web site: Yamaha Motorcycles.
Web site: Yamaha Sports YDS-3. 240 Landmarks of the Japanese Automotive Industry. Society of Automotive Engineers of Japan, Inc.. 10 August 2013. The Yamaha Autolube system employed a plunger pump as a method for allowing minute amounts of oil to spread over the lubricated surfaces of each engine part..
http://www.yamaha-motor.com/corporate/historytimeline.aspx, Yamaha website timeline, accessed October 2, 2011