Category:
Off-road Competition/Enduro Motorcycle
Target Audience:
Enthusiasts, mechanics, service technicians working on Yamaha WR450F models
Competitors 2006:
KTM EXC series, Honda CRF-X series, Kawasaki KXF series, Suzuki RM-Z series
Vehicle Attributes:
Liquid-cooled, DOHC, 5-valve, four-stroke engine; aluminum bilateral beam frame; KYB SSS (Speed Sensitive System) front forks; powerful braking system
Value:
Provides essential, detailed information for maintaining and repairing the 2006 Yamaha WR450F, ensuring optimal performance and longevity.
Engine:
Complete overhaul, top-end, bottom-end, lubrication, cooling, fuel, ignition, starting, exhaust
Transmission:
Clutch, gearbox internals, shift mechanism, lubrication
Drivetrain:
Chain drive, sprockets, gearbox output shaft
Suspension:
Front forks (KYB SSS), rear shock absorber (Monoshock), linkages, adjustments, servicing
Brakes:
Front and rear hydraulic disc brakes, master cylinders, calipers, hoses, bleeding, pad replacement
Electrical System:
Ignition system, lighting, charging system (stator, regulator/rectifier), battery, wiring diagrams, troubleshooting
Fuel System:
Carburetor (Keihin FCR), jetting, adjustments, cleaning, fuel pump (if applicable), fuel tank
Cooling System:
Radiator, coolant, hoses, fan (if applicable), thermostat
Wheels And Tires:
Rim maintenance, spoke tension, tire pressures, replacement
Frame And Bodywork:
Frame inspection, subframe, body panels, seat, fenders, handlebar, controls
Troubleshooting:
Diagnostic charts, common problems and solutions
Maintenance:
Oil changes, filter replacements, chain lubrication and adjustment, spark plug checks, valve clearance checks
Repair:
Engine rebuilds, transmission overhauls, suspension servicing, brake system repairs, carburetor tuning, electrical component replacement
Troubleshooting:
Detailed diagnostic steps for various performance issues, starting problems, electrical faults
Disassembly Reassembly:
Step-by-step instructions for component removal and installation
Depth:
Comprehensive, covering routine maintenance to full engine and transmission rebuilds, including detailed torque specifications and clearances
Engine Type:
Liquid-cooled, 4-stroke, DOHC, 5-valve
Bore X Stroke:
95.0 mm x 63.4 mm
Compression Ratio:
12.3:1
Horsepower Estimated:
Approximately 48-50 hp (at crank, may vary)
Torque Estimated:
Approximately 30-32 lb-ft (at crank, may vary)
Carburetor:
Keihin FCR39 (Flat CR)
Fuel Type:
Unleaded gasoline (91 octane or higher recommended)
Oil Type Recommendation:
Yamalube 4 (or equivalent) SAE 10W-40, API SG or higher
Oil Capacity W Filter:
1.00 L (1.06 US qt)
Coolant Type:
High-quality, permanent type coolant (50% ethylene glycol and 50% deionized water)
Ignition System:
TCI (Transistor Controlled Ignition)
Transmission Type:
Constant-mesh, 5-speed
Clutch Type:
Wet, multi-disc
Gear Ratios:
Specific ratios detailed in manual (e.g., 1st: 2.615, 2nd: 1.933, 3rd: 1.500, 4th: 1.235, 5th: 1.045)
Final Drive:
Chain drive (e.g., 14T front, 52T rear sprocket)
Transmission Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40, API SG or higher (same as engine oil)
Transmission Oil Capacity:
0.75 L (0.79 US qt)
Safety Features Design:
Designed for off-road use; lacks DOT certification and road-legal safety equipment (turn signals, mirrors, etc.)
Braking System:
Hydraulic disc brakes front and rear for strong stopping power.
Suspension Stability:
High-quality KYB suspension contributes to stability and control over varied terrain.
Frame Design:
Rigid aluminum bilateral beam frame for chassis integrity.
Engine Oil Change:
Every 1,000 km (600 miles) or 3 months, whichever comes first, or more frequently for hard riding conditions.
Air Filter Cleaning:
After every ride or as needed depending on conditions.
Chain Maintenance:
Clean and lubricate every 500 km (300 miles) or more frequently if riding in wet or dusty conditions. Adjust tension as needed.
Spark Plug Check:
Every 4,000 km (2,500 miles) or annually.
Valve Clearance Check:
Every 10,000 km (6,000 miles) or 2 years.
Engine Oil Spec:
Yamalube 4 (or equivalent) SAE 10W-40, API SG or higher
Brake Fluid Spec:
SAE J1703 or FMVSS No. 116 DOT 3
Coolant Spec:
Permanent type coolant (50% ethylene glycol, 50% deionized water)
Common Wear Items:
Clutch plates, chain and sprockets, tires, brake pads, fork seals, and swingarm bearings are common wear items in enduro bikes.
Carburetor Issues:
Potential for gumming if fuel sits for extended periods; requires periodic cleaning and adjustment.
Engine Decarbonization:
Regular decarbonization of the combustion chamber and piston crown can prevent performance degradation.
Yamaha Offroad Legacy:
Yamaha has a long and successful history in off-road racing and enduro, with models like the YZ and WR series being highly regarded.
Wr450F Development:
The WR450F platform evolved from Yamaha's successful YZ450F motocross bike, adapted for enduro use with features like wider gear ratios, larger fuel tank, and often different suspension settings.
Production Years:
The WR450F has been in continuous production since its introduction, with annual updates and revisions.
Model Reputation:
The WR450F platform has consistently received positive reviews from enthusiasts and off-road publications for its performance, reliability, and off-road capabilities.
Rider Feedback:
Highly praised for its potent engine, strong suspension, and overall durability in demanding off-road environments.
Emissions Compliance:
Designed for off-road competition, may not meet strict emissions standards for road use in all jurisdictions. Manual covers specifications relevant to its intended operation.
