2007 WR450F
Engine:(sigue un año mas con carburador)
* 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.
* Changing the cylinder mounting angle to a more vertical position in the new frame provides excellent overall machine balance.
* Revised camshafts, carburetion, intake ports, exhaust, etc., all work together to produce an engine with even more low- and mid-range power.
* 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.
* New, dry sump lubrication system carries the oil reservoir inside the engine cases, for excellent mass centralization and simplified plumbing.
* 39mm Keihin FCR flat-slide carburetor with throttle position sensor (TPS) produces ultra-precise fuel/air mixing and lightning-quick throttle response.
* New “no tools” airbox adopts hinge-type quick-open lid. Battery rides 8mm lower than before for improved handling.
* Digital CDI ignition system delivers more precise spark and monitors engine speed to ensure optimal timing for fast, strong response during hard acceleration.
* New, bigger radiators with reinforcements ensure maximum cooling efficiency with greater strength.
* 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.
* Lightweight exhaust system maximizes engine power and allows hassle-free replacement of oil filter.
* Aluminum muffler with USFS-approved spark arrestor looks trick and keeps things light.
* Works-style clutch lever features oversize barrel adjuster for easy, on-the-fly adjustability of lever/cable play.
* Electric start ensures easy restarts.
Chassis/Suspension:
* All-new YZ-inspired aluminum frame helps reduce weight while optimizing mass centralization. An extensively tested assembly of aluminum forgings, castings and extrusions. The new WR frame retains legendary Yamaha handling and response.
* Removable aluminum rear subframe constructed of square-section tube for reduced weight.
* Fully adjustable air/oil-separate 48mm fork tubes deliver precise, fade-free handling; fork protectors provide excellent tube coverage.
* Tapered swingarm adopts YZ-style linkage for controlled, compliant rear suspension action. Revised axle and holders reduce weight in a critical area.
* The Kayaba shock provides 12.0 inches of travel with adjusters for high- and low-speed compression damping, rebound and spring preload—and features a larger piggyback reservoir for excellent damping and fade resistance.
* New, wave disc brake rotors front and rear reduce unsprung weight and provide excellent performance. Front and rear calipers with aluminum pistons deliver strong stopping power with progressive feel.
* Lightweight 21-inch front and 18-inch rear Excel rims provide exceptional durability and help reduce unsprung weight for optimal suspension performance.
* Premium Dunlops offer unbeatable, competition-spec traction and excellent wear.
Additional Features:
* Cool new YZ-derived bodywork, new engine covers and a thick new seat look great and feel excellent on long rides.
* New ProTaper aluminum handlebar and new forged triple clamp shaves weight and provides easier, lighter cornering.
* Slim design lightweight fuel tank holds 2.1 gallons.
* One-piece, high strength, plastic skid plate shaves weight and offers great protection.
* Lightweight headlight and sweet LED taillight maximize visibility and draw less current.
* Adjustable front brake lever.
* Wide footpegs are also lower for more comfort.
* Repackable aluminum muffler.
* Front wheel collar makes front wheel removal quick and easy.
