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The WR in the name indicates a wide-ratio gear box common to most enduro or trail bikes and stands in contrast to the close-ratio gearbox essential to a motocross racer. Over the years the WR250F has benefited from the advances made in the YZF motocross version, gaining advancements such as an aluminum frame and improved suspension.
For 2007, the WR gained an aluminum frame dropping the weight from 249 to 246 pounds. [8] In addition to the aluminum frame, the 2007 WR450F saw a revised dry-sump engine, with a new balancer, cylinder head, and camshafts with less lift and duration than previous generations and restyled plastics. 2009 saw new graphics, and 2010 was not sold in ...
The Yamaha WR250R is a dual-sport motorcycle made by Yamaha Motor Company. It has a 250cc (15 cu in) liquid-cooled single-cylinder four-stroke DOHC engine, fed premium fuel by electronic fuel injection. [3] It has remained largely unchanged since its introduction in 2008, with most differences being cosmetic. [4]
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]
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The family-run company Harris Performance Products is based in Hertford and designs, develops, manufactures and markets road and racing motorcycle chassis and components. . The company was established in 1972 by Lester and Steve Harris, with a third director Stephen Bayfo