- 449cc liquid-cooled, DOHC four-stroke with titanium valves delivers more broad power than ever, with high over-rev capacity and crisp, linear throttle response.
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- Changing the cylinder mounting angle to a more vertical position in the new frame provides excellent overall machine balance.
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- Revised camshafts, carburetion, intake ports, exhaust, etc.,
all work together to produce an engine with even more low- and mid-range power.
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- New crank with revised balance factor and new AC generator
provides super-smooth running. Strong new connecting rod and
piston oil-jet for increased cooling and long life.
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- New, dry sump lubrication system carries the oil reservoir
inside the engine cases, for excellent mass centralization and simplified plumbing.
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- 39mm Keihin FCR flat-slide carburetor with throttle position sensor (TPS) produces ultra-precise fuel/air mixing and lightning-quick throttle response.
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- New “no tools” airbox adopts hinge-type quick-open lid. Battery rides 8mm lower than before for improved handling.
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- Digital CDI ignition system delivers more precise spark and monitors engine speed to ensure optimal timing for fast, strong response during hard acceleration.
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- New, bigger radiators with reinforcements ensure maximum cooling efficiency with greater strength.
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- Wide-ratio five-speed transmission uses strengthened gears and YZ450F-spec multiplate clutch—good for quick-hitting power in the woods as well as eye-opening top-end power.
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- Lightweight exhaust system maximizes engine power and allows
hassle-free replacement of oil filter.
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- Aluminum muffler with USFS-approved spark arrestor looks trick and keeps things light.
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- Works-style clutch lever features oversize barrel adjuster for easy, on-the-fly adjustability of lever/cable play.
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- Electric start ensures easy restarts.
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