- Liquid-cooled, 449cc, five-valve, DOHC, four-stroke with titanium valves features 95mm bore and 63.4mm stroke for massive power with high over-rev capacity and crisp, linear throttle response.
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- Reliable, pushbutton electric start in any gear adds extra convenience.
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- High performance 39mm Keihin FCR flat-slide carburetor with throttle position sensor (TPS) delivers ultra-precise fuel/air mixing and crisp throttle response.
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- Additional weight-saving engine features include: magnesium cylinder head cover and right side crankcase cover; small-design cam chain tensioner and oil pump; aluminum oil hose; and light CDI ignition unit.
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- Trick, works-style clutch lever features oversize barrel adjuster for easy, no tool adjustability of lever/cable play.
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- Dry sump engine carries oil in an aluminum tank directly in front of the engine for excellent cooling and optimal protection from rocks or mud.
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- DC ignition system delivers ultra-precise spark and 3D timing for faster, stronger engine response during hard acceleration.
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- High-performance stainless steel exhaust header is mated to a USFS-approved spark arrestor.
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- Smooth-shifting YZ-spec ratchet-type five-speed transmission and heavy-duty clutch deliver all that power to the rear tires with maximum efficiency.
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- Large capacity airbox features no-tool access to the oiled dual foam filter for easy maintenance.
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- Ignition coil is integrated into the spark plug cap; extremely light and compact.
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