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--also 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.
