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General Moto | Off-Topic Posts
2010 YZ450F rumors . . .
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[QUOTE="Rich Rohrich, post: 1365156, member: 16241"] I don't know who did it first, but this isn't unfamiliar territory for Yamaha. [i]Paraphrased from Motorcyclist Magazine article[/i] The Yamaha works OW48R inline-four GP two-stroke, on which Kenny Roberts won the 1980 500cc World Championship. It had the outer cylinders reversed (thus the "R" designation), Roberts says it was "the best inline-four Yamaha ever produced" Additional info from MCNews OW48R (1980) - Parallel four for Roberts' third title The OW48R spec introduced at the Dutch GP, round four of the '80 series, was not based on the OW48 with its aluminium frame. It adopted a steel frame of the type used on the previous year's OW45 spec and mounted an engine with rear-directional (reverse) exhaust for increased power output. Introducing rear exhaust on the first and fourth cylinders, in other words the two outer cylinders, increased power by 7PS. The R in this spec's name stood for reverse. Roberts began the '80 GP500 season with three consecutive wins on the OW48 and then rode the OW48R in round four, the Dutch GP. In this race he was forced to retire due to an air leak in one of his tires, but he rode this spec again at round five, the Belgian GP, and finished third. For rounds six and seven he returned to the OW48 and mounted the podium with two second-place finishes. For the final round he rode a OW48R with aluminium frame (prototype for the next year's OW53) and finished fourth. While changing machines three times in the course of the season Roberts won his third consecutive title. [IMG]http://www.tz350.net/images/fam/ow48r_engine.jpg[/IMG] [IMG]http://image.motorcyclistonline.com/f/8838661/122_0306_29z+Yamaha_OW48R+Right_Side_View_Riding.jpg[/IMG] [/QUOTE]
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MX, SX & Off-Road Discussions
General Moto | Off-Topic Posts
2010 YZ450F rumors . . .
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