1. Engine: Liquid-cooled, 4-stroke, 5-valve, single-cylinder engine with a displacement of 449cc. The engine is designed for high performance and durability, with a bore of 95mm and a stroke of 63.4mm. It features a 12.5:1 compression ratio and produces a maximum power output of 48 horsepower at 8,500 rpm and 39 lb-ft of torque at 6,500 rpm.
2. Drive Train: The engine is mated to a 5-speed constant mesh transmission with a multi-plate wet clutch. The transmission provides smooth and precise shifting, allowing the rider to adapt to varying riding conditions. The drive system also includes a durable chain that transmits power from the transmission to the rear wheel.
3. Suspension: The WR450F features a fully adjustable suspension system designed for both on- and off-road riding. The front suspension consists of 46mm inverted Kayaba forks with adjustable compression, rebound, and preload settings. The rear suspension utilizes a linkage-type system with a Kayaba shock absorber, also adjustable for compression, rebound, and preload. This suspension system provides excellent handling and stability, allowing the rider to navigate rough terrain and absorb impacts.
4. Brakes: The bike is equipped with hydraulic disc brakes for reliable and responsive stopping power. The front brake features a 250mm floating disc with a dual-piston caliper, while the rear brake has a 245mm disc with a single-piston caliper. These brakes provide excellent feel and modulation, allowing the rider to control their speed with confidence.
5. Frame: The WR450F utilizes a lightweight and durable aluminum frame designed for rigidity and handling. The frame is constructed using a combination of cast and extruded aluminum components, resulting in a strong and stable platform for the bike's components.
6. Bodywork and Ergonomics: The bike's bodywork is designed to provide comfort and functionality for the rider. The seat is wide and supportive, allowing for extended riding sessions without discomfort. The handlebars are positioned for an upright and comfortable riding position, reducing fatigue and improving control. The bike also features a compact fuel tank that is positioned to centralize weight and improve handling.
7. Electrical System: The WR450F is equipped with a reliable electrical system that powers the bike's ignition, lighting, and instrumentation. The system includes a high-output magneto generator that provides ample power for the bike's electrical components and a maintenance-free battery that ensures reliable starting.
8. Additional Features: The bike comes equipped with a range of additional features that enhance its performance and functionality. These include an odometer, hour meter, and a kickstand. The WR450F also features a durable skid plate that protects the engine and other vital components from damage while riding off-road.

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YAMAHA WR450 WR450FR WR450F WR 450 FR F YZ YZ-WR-450 YZWR450 ENDURO 2TRAC 2 TRAC 2-TRAC FACTORY SERVICE REPAIR MANUAL 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 98 99 00 01 02 03 04 05 06 07 FSM SHOP WORKSHOP MAINTENENCE MAINTENANCE MICROFICHE MICROFICHES
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YAMAHA WR450 WR450FR WR450F WR 450 FR F YZ YZ-WR-450 YZWR450 ENDURO 2TRAC 2 TRAC 2-TRAC FACTORY SERVICE REPAIR MANUAL 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 98 99 00 01 02 03 04 05 06 07 FSM SHOP WORKSHOP MAINTENENCE MAINTENANCE MICROFICHE MICROFICHES

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YAMAHA WR450 1998-2007 FACTORY REPAIR MANUAL
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