List of Yamaha motorcycles

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
YC-1 was the second bike manufactured by Yamaha; it was a 175 cc single cylinder two-stroke.
YD-1 Yamaha began production of its first 250 cc, two-stroke twin, the YD1.
MF-1 50 cc, two-stroke, single cylinder, step through street bike
YDS-3 246 cc, two-stroke, parallel-twin, it used the world's first oil injection lubrication system in a 2-stroke engine.
DT-1 Yamaha's first true off-road motorcycle.
XS-1 Yamaha's first four-stroke engine motorcycle.
YZ Monocross First production motocross bike with a single rear shock.
YZ400F First mass-produced four-stroke motocross motorcycle.

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.