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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]
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John Kocinski (born March 20, 1968, in Little Rock, Arkansas) is a retired American Grand Prix motorcycle road racer whose successes include winning the 1990 250cc World Championship and the 1997 Superbike World Championship title.
For the Florida Winter-AMA series, Hannah rode a production Yamaha YZ250 to win eight consecutive motos in taking the 250cc title. [17] He won the AMA Supercross Championship in impressive fashion, taking six of the 10 rounds. [14] As defending 125cc national champion, he won three of the six rounds.
In 2003 it received an aluminum subframe, which was replaced in the 2006 model with an all-aluminum frame. The YZ250F has been praised for combining the broad-power characteristics of a four-stroke engine with the light handling more common in smaller, 125 cc two-stroke motorcycles.
The suspect in the New Orleans attack that killed 14 people on New Year's Day is believed to have acted alone in a "premeditated and evil act," the FBI has said. The latest information is counter ...
Having been discontinued in 1991 in favor of the Yamaha XT350, this model was reintroduced in 2008, replacing the Yamaha XT225, due to increased popularity of the 250 cc class. [4] The XT250 is branded the SEROW 250 in Japan.