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Thursday, May 21, 2009

Yamaha Sport Motorcycles






Yamaha Sport Motorcycles
This page contains technical date, photographs and specifications for some of the world's most powerful production motorcycles and super-street race bikes.

Light, powerful and bristling with knowledge gained from years of racing, the YZF-R6 is the most advanced production middleweight motorcycle Yamaha - or anybody else - has ever built. * The YZF-R6 was the first production motorcycle with a fly-by-wire throttle system?or flawless response under all conditions. * Straight frame concept: developed from the Yamaha M1 GP machine, the YZF-R6? steering head, swingarm pivot and rear axle all lie in a straight line?or unsurpassed handling?ith an inline four-cylinder engine designed for optimal layout and mass centralization. * Slipper-type back torque-limiting clutch greatly facilitates braking/down shifting from high speed. * Formula 1-style air management presents very small frontal area for excellent aerodynamics; ram-air induction ducts cool, high-pressure air through the steering head for optimal combustion, more horsepower and enhanced engine cooling. * The YZF-R6 is the AMA Supersport Champion in its rookie season. * Compact, lightweight 67 x 42.5mm 599cc DOHC 16-valve liquid-cooled inline four-cylinder features titanium valves, 12.8:1 compression and compact combustion chambers for awesome, lightning-quick response. * YCC-T (Yamaha Chip Controlled Throttle) uses a powerful ECU and multiple sensors to provide perfect, smooth engine response and optimal power whenever the throttle is twisted, under all conditions. * Twin-injector fuel injection: shower-type injectors above each intake funnel help achieve optimum fuel atomization at high rpm. * Back torque-limiting slipper clutch greatly facilitates braking and downshifting from high speed. Close-ratio six-speed transmission delivers seamless power and maximum acceleration. * Despite the increased bore, piston and pin weight has been reduced for more power and smoothness; 1mm smaller main journals reduce friction while 1mm larger connecting rod journals increase performance. * Compact slant-block engine design uses widely triangulated gearbox shafts to make the GP-derived, straight frame concept work; optimum weight distribution and excellent handling are the result. * GP-style titanium muffler contributes to mass centralization, and contains EXUP, an O2 sensor and catalyzers for a broad powerband, spot-on injection and EU-3 emissions compliance. * Linerless, direct-plated ceramic-composite cylinder bores mean greater heat dissipation for consistent power delivery and reduced friction?lso a narrow engine. * Cool magnesium valve and engine covers are light and stylish. Curved radiator with twin-ring cooling fans keeps everything cool. * Direct ignition coils, dual-electrode spark plugs and high-output magneto deliver extremely accurate, reliable firing.

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