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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.
1990s video albums (11 C, 2 P) M. 1990s music videos (13 P) This page was last edited on 15 November 2023, at 23:38 (UTC). Text is available under the Creative ...
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]
The first-time model agreed to help Anderson during an impromptu lunch break. “They wrapped a sheet around me and I held a regular little desk lamp, a side lamp,” Joseph recalled of that day ...
This page was last edited on 17 December 2022, at 09:35 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
The Yamaha YZ450F is a four-stroke racing motocross bike built by Yamaha Motor Corporation.It was the successor to the previous YZ426F which was discontinued in 2003. It is credited by Cycle World and Dirt Rider magazines as the bike that started the four-stroke dirt bike revolution.
Model Constructors' championship; 1973: 0W20: Liquid-cooled, inline-4, two-stroke engine, chromoly frame. Yamaha's first 500cc factory bike won from the outset at the first round of the 1973 season, ridden by Jarno Saarinen. 2nd 1974: 0W23: Yamaha's first machine created specifically for 500cc racing.
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