- 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.
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- YCCT—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.
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- Twin-injector fuel injection: shower-type injectors above
each intake funnel help achieve optimum fuel atomization
at high rpm.
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- Back torque-limiting slipper clutch greatly facilitates
braking and downshifting from high speed. Close-ratio
six-speed transmission delivers seamless power and
maximum acceleration.
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- Despite the increased bore, piston and pin weight has been
reduced for more power and less vibration; 1mm smaller
main journals reduce friction while 1mm larger connecting
rod journals increase performance.
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- 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.
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- 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.
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- Linerless, direct-plated ceramic-composite cylinder bores
mean greater heat dissipation for consistent power delivery
and reduced friction—also a narrow engine.
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- Cool magnesium valve and engine covers are light and
stylish. Curved radiator with twin-ring cooling fans keeps
everything cool.
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- Direct ignition coils, dual-electrode spark plugs and highoutput magneto deliver extremely accurate, reliable firing.
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