🏷️ Basic Information

Make:

Yamaha

Model:

WR450

Year:

2005

Product Type:

Service Repair Manual

Chassis Code General:

5TA (for WR450F models)

Model Generation:

Second Generation (2003-2006)

👋 Introduction

Vehicle Segment:

High-performance Off-road Motorcycle (Enduro/Motocross)

Intended Use:

Competitive off-road riding, trail riding, motocross

Key Competitors 2005:

Honda CRF450X, KTM 450 EXC, Suzuki RM-Z450, Kawasaki KX450F

Engine Type Highlight:

Liquid-cooled, DOHC, 4-stroke, single-cylinder

Suspension Technology:

Long-travel, adjustable Kayaba (KYB) suspension

Chassis Design:

Aluminum frame for light weight and rigidity

📋 Manual Details

Engine Repair:

Comprehensive

Chassis Maintenance:

Comprehensive

Electrical System Diagnosis:

Comprehensive

Troubleshooting:

Detailed

Estimated Pages:

200-300 (typical for this era/type of manual)

Manual Classification:

Factory Service Manual

Language Supported:

English

Digital Format:

PDF Download

📖 Manual Coverage

Engine Mechanical:

Yes (Top end, bottom end, valve train, lubrication, cooling)

Fuel System:

Yes (Carburetor overhaul, fuel lines, fuel tank)

Ignition System:

Yes (CDI, ignition coil, spark plug)

Exhaust System:

Yes (Muffler, header pipe, heat shields)

Transmission And Drivetrain:

Yes (Clutch operation, gearbox, final drive)

Suspension Front:

Yes (Fork disassembly, oil changes, seals, damping adjustments)

Suspension Rear:

Yes (Shock absorber overhaul, linkage maintenance, spring adjustments)

Braking System:

Yes (Hydraulic brake systems, caliper service, master cylinder, fluid replacement, bleeding)

Wheel And Tire:

Yes (Wheel bearing service, tire changes, spoke tension)

Electrical System Components:

Yes (Lighting, horn, battery, starter motor, stator, wiring diagrams)

Frame And Bodywork:

Yes (Frame inspection, seat, plastics, fenders, handlebars)

Routine Maintenance:

Yes (Oil changes, filter replacement, chain adjustment, lubrication)

Engine Rebuild:

Yes (Complete top-end and bottom-end rebuild procedures)

Carburetor Tuning:

Yes (Jetting, float adjustment, cleaning)

Suspension Setup:

Yes (Oil levels, fork pressure, shock adjustments)

Brake Bleeding:

Yes (Front and rear brake systems)

Troubleshooting Fault Finding:

Yes (Diagnostic flowcharts and common issue resolution)

Wiring Diagram Interpretation:

Yes (Color-coded and detailed electrical schematics)

Diagnostic Capabilities:

Advanced (Includes detailed troubleshooting guides and specifications)

Rebuild Level:

Complete (From basic maintenance to full engine and component overhauls)

Special Tools Requirement:

Specified (Lists any necessary special tools for specific procedures)

📊 Manual Specifications

File Type:

PDF

Searchability:

Searchable text (if properly OCR'd)

Illustration Clarity:

High (Detailed and clear illustrations)

Binding Description:

N/A (Digital download)

Paper Description:

N/A (Digital download)

⚙️ Engine Specifications

Engine Displacement:

449 cc (27.4 cu. in.)

Engine Bore X Stroke:

95.0 mm x 63.4 mm (3.74 in x 2.50 in)

Compression Ratio:

12.5:1

Valve Actuation:

DOHC, 4 valves

Horsepower Estimated:

Approximately 45-50 HP (at crank, depending on tuning and specific model variant)

Torque Estimated:

Approximately 30-33 lb-ft (at crank)

Carburetor Type:

Keihin FCR MX39 (flat slide, accelerator pump)

Fuel Type:

Unleaded gasoline, octane rating 91 or higher recommended

Oil Capacity With Filter Change:

1.10 L (1.16 US qt, 0.97 Imp qt)

Coolant Type:

Yamalube High Performance Coolant or equivalent (50/50 mix of antifreeze and distilled water)

Coolant Capacity:

0.85 L (0.89 US qt)

🔧 Transmission

Transmission Type:

5-speed, constant mesh

Clutch Type:

Wet, multi-disc

Final Drive:

Chain drive

Transmission Oil Type:

Yamalube 4-stroke motorcycle oil (10W-40 recommended) or API SG or higher, JASO MA compliant

Transmission Oil Capacity:

0.70 L (0.74 US qt)

📐 Dimensions

Overall Length:

2,170 mm (85.4 in)

Overall Width:

825 mm (32.5 in)

Overall Height:

1,245 mm (49.0 in)

Seat Height:

985 mm (38.8 in)

Wheelbase:

1,485 mm (58.5 in)

Dry Weight:

113 kg (249 lbs)

Wet Weight Estimated:

Approximately 120 kg (265 lbs) with all fluids

Fuel Tank Capacity:

9.0 L (2.4 US gal)

🛡️ Safety Features

Crash Test Ratings:

N/A (Motorcycle, not subject to automotive crash testing standards)

Braking System Type:

Hydraulic disc brakes (Front and Rear)

Front Brake Specification:

250 mm petal disc

Rear Brake Specification:

245 mm petal disc

Lighting:

Halogen headlight, LED taillight

Horn:

Yes

💡 Technology Features

Infotainment System:

None (Performance-oriented off-road motorcycle)

Traction Control:

No

ABS:

No

Bluetooth Connectivity:

No

Ignition Type:

Digital CDI (Capacitor Discharge Ignition)

Lighting Type:

12V Halogen Headlight, 12V LED Taillight

🔧 Maintenance

Engine Oil Change:

Every 20 hours of riding or every 3 months, whichever comes first.

Oil Filter Replacement:

Every engine oil change (recommended).

Air Filter Cleaning:

Every 5-10 hours of riding or as needed based on riding conditions.

Spark Plug Inspection Cleaning:

Every 20 hours of riding.

Valve Clearance Check:

Every 200 hours of riding or annually.

Chain Lubrication Adjustment:

Every 5-10 hours of riding or after washing.

Engine Oil Viscosity:

10W-40

Brake Fluid Type:

DOT 3 or DOT 4 hydraulic brake fluid.

Carburetor Idling Instability:

Some models may experience occasional idling issues, often resolved by cleaning the carburetor or adjusting the idle screw.

Clutch Lever Play:

Regular adjustment of clutch cable free play is important for smooth operation.

Suspension Seal Wear:

As with many dirt bikes, fork seals can wear over time, especially with aggressive riding. Regular inspection and maintenance are advised.

📚 Vehicle History

Yamaha Motorcycles:

Yamaha Motor Company is a Japanese manufacturer of motorcycles, marine products, and other motorized products. Founded in 1955, Yamaha has a long and rich history in motorsports, particularly in road racing and motocross.

Wr450F Timeline:

The WR450F, introduced as a four-stroke alternative to their two-stroke YZ models, evolved significantly. The 2003 model year marked a major redesign with a new aluminum frame and a 450cc engine. The 2005 model continued this successful platform with refinements. Subsequent models introduced fuel injection and other technological advancements.

Manufacturing Origin:

Japan

🏆 Awards & Recognition

Motocross Magazine Awards:

The WR450F platform generally received positive reviews and accolades in motocross and off-road publications for its power and handling in its class during its production years.

Overall Performance Rating:

Highly rated for off-road performance and engine power.

Emissions Certification:

Compliant with prevailing emissions standards for off-road vehicles of its time in its intended markets.