Category:
High-performance off-road/enduro motorcycle
Target User:
Enthusiast riders, off-road competitors, trail riders
Segment:
450cc 4-stroke off-road competition class
Engine Type:
High-revving, liquid-cooled, 4-stroke, DOHC, 4-valve
Chassis Design:
Lightweight, durable frame, advanced suspension components
Technology:
Fuel injection, advanced electronics for engine management
Primary Coverage:
Workshop Service Repair
Scope:
Comprehensive diagnostics, repair, and maintenance
Estimated Page Count:
Detailed (actual count not specified in product description, typical for workshop manuals to be extensive)
Type:
Workshop Service Repair Manual
Format:
Digital Download (PDF)
Engine:
Full engine overhaul, internal components, lubrication, cooling, fuel injection, ignition, starting system
Transmission:
Clutch, gearbox, shift mechanism, lubrication, troubleshooting
Chassis:
Frame, suspension (front forks, rear shock), steering, swingarm, wheel bearings
Brakes:
Hydraulic disc brakes (front and rear), caliper maintenance, bleeding procedures, master cylinders
Electrical System:
Wiring diagrams, lighting, battery, charging system, ECU, sensors, starter motor, ignition coils
Fuel System:
Fuel pump, injectors, fuel lines, fuel tank, air filter system
Cooling System:
Radiator, coolant lines, thermostat, water pump, fan (if applicable)
Maintenance:
Scheduled maintenance, oil changes, filter replacements, chain adjustment, tire pressure
Troubleshooting:
Diagnostic charts, common problems and solutions, error codes
Repair:
Component removal and installation, detailed disassembly and reassembly instructions
Inspection:
Wear limits, component checks, pre-ride inspections
Adjustments:
Carburetor (if applicable, though WR450FR is FI), clutch, throttle, brakes
Depth:
Complete workshop level, suitable for professional technicians and experienced DIY mechanics
Detail Level:
Illustrated with clear step-by-step instructions
Engine Type:
4-stroke, DOHC, 4-valve, Liquid-cooled
Displacement:
449 cc (exact displacement may vary slightly by year, standard for this class)
Bore X Stroke:
Typically around 95.0 mm x 63.1 mm (specifics to be confirmed in manual)
Compression Ratio:
High, designed for performance (e.g., 12.5:1 or higher, check manual for exact)
Horsepower:
Estimated 50+ HP (factory figures often conservative, actual performance higher)
Torque:
Strong mid-range and top-end torque, specific figures to be confirmed
Fuel Delivery:
Electronic Fuel Injection (EFI) with throttle body size typically 44mm
Fuel Type:
Unleaded gasoline (Octane rating as specified by Yamaha, typically 91 or higher)
Oil Type:
Yamalube (or equivalent) performance 4-stroke motorcycle oil, SAE 10W-40 or 20W-40 depending on temperature (refer to manual for exact specification)
Oil Capacity:
Approximately 0.9 - 1.1 Liters (refer to manual for exact capacity with filter change)
Type:
Forced, liquid-cooled
Type:
Constant mesh, 5-speed sequential
Clutch:
Wet, multiple-disc, cable operated
Transmission Oil:
Yamalube (or equivalent) Gear Oil 80W or 10W-30 motorcycle oil (refer to manual for exact specification and capacity)
Length:
Approx. 2175 mm (specifics may vary by year)
Width:
Approx. 815 mm (specifics may vary by year)
Height:
Approx. 1280 mm (specifics may vary by year)
Wet Weight:
Approx. 115 kg (without fuel, depending on configuration)
Dry Weight:
Approx. 111 kg (specifics may vary by year)
Front Tire Size:
80/100-21 51M (common for off-road, check manual for exact)
Rear Tire Size:
110/100-18 64M (common for off-road, check manual for exact)
Front Wheel:
21 inch spoke wheel
Rear Wheel:
18 inch spoke wheel
Ground Clearance:
Significant, designed for off-road obstacle clearance (specific value in manual)
Certification:
Off-road use focused, not typically rated for road safety certifications like NHTSA or Euro NCAP
Braking System:
Powerful hydraulic disc brakes (front and rear), designed for precise control
Frame Construction:
Lightweight yet robust aluminum frame for rider confidence
Ergonomics:
Designed for rider control and comfort during aggressive riding
Features:
N/A (This is a competition off-road motorcycle, not equipped with typical infotainment features)
Features:
N/A (Focus is on rider control and machine performance, not electronic driver aids)
Features:
N/A (No Bluetooth or Wi-Fi connectivity)
System:
Electronic Fuel Injection (EFI) with onboard ECU for optimized performance and emissions control
Features:
Tuning capabilities may be available via specific accessories or advanced diagnostics covered in the manual.
Engine Oil Change:
Typically every 10-20 hours of riding or monthly, whichever comes first (refer to manual for precise intervals based on usage)
Air Filter Cleaning:
Regularly, potentially after every few rides or based on dust conditions (detailed in manual)
Chain Lubrication Adjustment:
Frequent checks and lubrication are crucial for longevity (intervals detailed in manual)
Spark Plug Inspection:
Recommended at scheduled intervals (e.g., every 100-200 hours of riding, check manual)
Coolant Type:
High-quality ethylene glycol-based coolant (50/50 mixture with distilled water), Yamaha specific coolant recommended
Common Wear Items:
Clutch plates, brake pads, fork seals, chain and sprockets, wheel bearings are typical wear items for this type of motorcycle.
Potential Faults:
While generally reliable, common off-road issues like over-heating under extreme conditions, suspension wear, and drivetrain wear can occur. The manual provides diagnostics for all systems.
Manufacturer:
Yamaha Motor Corporation, known for its long history in motorcycle manufacturing and motorsports
Lineage:
Part of Yamaha's successful WR (Wide Ratio) line of off-road competition motorcycles, evolved from earlier YZ models
Introduction Era:
The WR450 platform has seen continuous development over many years, with significant updates including the adoption of fuel injection.
Manufacturing Location:
Primarily Japan (specific assembly locations may vary by market)
