Market Segment:
Competition/Enduro Motorcycle
Target Audience:
Off-road riders, enduro racers, recreational trail riders, and DIY motorcycle mechanics.
Competitors:
KTM EXC series, Honda CRF-X series, Kawasaki KLX-R series, Suzuki RM-Z series (off-road variants).
Vehicle Focus:
Performance off-road capabilities, durability, reliability, rider-focused ergonomics.
Covered Years:
2008, 2009, 2010, 2011, 2012
Estimated Page Count:
~500-700 pages (typical for a comprehensive service manual)
Manual Type:
Service Repair Workshop Manual
Format:
Digital Download (PDF)
Engine Systems:
Engine disassembly, assembly, tuning, cooling system, lubrication system, fuel system (carburetor specifics), ignition system, starting system, exhaust system.
Drivetrain Systems:
Transmission, clutch, final drive (chain and sprockets), gearbox, shift mechanism.
Chassis Systems:
Frame, suspension (front forks and rear shock absorber), steering system, wheels, tires, brakes (front and rear disc brakes).
Electrical Systems:
Wiring diagrams, lighting, battery, charging system (stator, regulator/rectifier), ignition system components, starter motor, instrument panel, sensors.
Bodywork And Controls:
Body panels, seat, handlebars, levers, cables, footpegs, fuel tank, fenders.
Routine Maintenance:
Oil change, filter replacement, chain adjustment, spark plug inspection/replacement, air filter cleaning/replacement, brake fluid checks, tire pressure checks.
Troubleshooting Guides:
Diagnostic procedures for common issues, symptom-based troubleshooting, electrical fault finding.
Repair And Rebuild:
Detailed step-by-step instructions for engine rebuilds, transmission overhauls, suspension servicing, brake caliper rebuilds, carburetor cleaning and adjustment.
Technical Specifications:
Torque specifications, clearances, fluid capacities, electrical component data, dimensions.
Special Tools:
Identification and usage of specialized tools required for specific repair procedures.
Depth Of Coverage:
Comprehensive, covering everything from basic maintenance to full engine and component overhauls. Suitable for both home mechanics and professional technicians.
Engine Type:
Four-stroke, liquid-cooled, DOHC, 4-valve
Engine Displacement:
449 cc
Bore X Stroke:
95.0 mm x 63.4 mm
Horsepower:
~45-50 HP (Est. crank horsepower, varies with tuning)
Torque:
~40-45 Nm (Est. crank torque, varies with tuning)
Carburetor Type:
Keihin FCR MX39 (Flatslide, Accelerator Pump)
Fuel Type:
Unleaded gasoline, minimum 91 octane recommended
Ignition Type:
TCI (Transistor Controlled Ignition)
Cooling Method:
Liquid-cooled
Oil Type:
Yamalube 4 (or equivalent 4-stroke motorcycle oil), SAE 10W-40, API SG or higher.
Safety Ratings:
N/A (Off-road vehicles are not typically subjected to the same crash safety standards as street-legal vehicles.)
Braking System:
Hydraulic dual-disc front brakes, Hydraulic single-disc rear brake.
Suspension Features:
Adjustable front forks (compression and rebound damping), adjustable rear shock absorber (preload, compression, and rebound damping).
Frame Construction:
Aluminum bilateral beam frame for rigidity and light weight.
Infotainment System:
N/A (Basic instrument cluster, no infotainment system.)
Assistance Features:
N/A (Focus is on rider control and mechanical performance, not electronic driver aids.)
Connectivity Features:
N/A (No Bluetooth or smartphone integration.)
Fuel Injection Vs Carburetion:
This generation utilizes a carburetor (Keihin FCR MX39), not fuel injection. Later generations switched to fuel injection.
Engine Oil Change:
Every 10-15 hours of riding or every 3 months, whichever comes first.
Oil Filter Replacement:
Every 20-30 hours of riding or every 6 months.
Air Filter Cleaning:
Every 5-10 hours of riding, or more frequently in dusty conditions.
Spark Plug Inspection:
Every 10-15 hours of riding.
Chain Lubrication Adjustment:
Every 5-10 hours of riding, or after washing/wet conditions.
Engine Oil Capacity:
1.00 L (1.06 US qt) without oil filter replacement; 1.10 L (1.16 US qt) with oil filter replacement.
Coolant Type:
Yamaha Super Coolant (or equivalent premium ethylene glycol-based coolant with distilled water), 50:50 mixture.
Common Wear Items:
Clutch plates, brake pads, wheel bearings, steering head bearings, fork seals, chain and sprockets are common wear items on high-performance off-road motorcycles.
Carburetor Tuning:
Some owners report a need for fine-tuning the Keihin FCR carburetor for optimal performance at different altitudes and temperatures. Accelerator pump adjustment is key.
Engine Longevity:
While robust, consistent maintenance is crucial for engine longevity, particularly oil changes and air filter cleaning.
Brand Focus:
Yamaha has a long-standing heritage in motorsports, particularly in motocross and enduro racing, known for its innovative engine technology and reliable performance.
Wr450F Development:
The WR450F is Yamaha's flagship 450cc 4-stroke enduro competition bike, evolving from earlier WR models and often sharing technology with its motocross counterpart, the YZ450F, but tuned for broader power delivery and off-road usability.
Manufacturing Location:
Japan
