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The original YZ250 of 1974 used an air-cooled 250cc two-stroke engine of 70 mm bore and a 64 mm stroke, which was improved semi-annually. The air-cooled motor was replaced in 1982 with a 249 cc liquid-cooled two-stroke reed-valved engine with a mechanical, rather than servo-driven, YPVS exhaust valve for a wider spread of power.
Yamaha YA-1. 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]
Yamaha was the first to build a production monoshock motocross bike (1975 for 250 and 400, 1976 for 125) and one of the first to have a water-cooled motocross production bike (1977 in works bikes, 1981 in off-the-shelf bikes). Yamaha's first Motocross competition four-stroke bike, the YZ400F, won the 1998 USA outdoor national Championship with ...
The Yamaha YZ250F is a motocross motorcycle first released in 2001 by Yamaha.It features a DOHC, four-stroke engine and initially had a steel frame and subframe in 2001–2002.
Introduced in 2004 the chrome-moly framed enduro bikes (with Beta 250, 400, 450, 525 RFS motors) came equipped with Nissin brakes and rotors, Marzocchi forks, and a Sachs rear shock. For 2007 the RR models were upgraded with a removable clutch sub-cover, upgraded front fork settings, and a redesigned rear swing arm.
The Yamaha YZ125 is a motocross racing motorcycle with a two-stroke 124.9 cc (7.62 cu in) displacement single-cylinder engine made by Yamaha since 1974. It is available to the public.
Yamaha announced the release of the MT-09 Tracer on November 4, 2014, as a variant based on the popular MT-09 sports model powered by an 850cc in-line three-cylinder engine. [4]
2002 was the first season that allowed 990 cc 4-strokes to be raced alongside 500 cc 2-strokes.In a change from their V-4 YZR500, Yamaha designed the YZR-M1 (for "Mission One") with an inline-4 engine because it was the format considered to have the best mutual balance with the frame. [2]