Segment:
High-performance motocross competition bike
Target Audience:
Motocross racers, performance off-road enthusiasts, mechanics specializing in dirt bikes.
Key Competitors:
Honda CRF450R, Kawasaki KX450F, KTM 450 SX-F, Suzuki RM-Z450.
Innovation:
For the 2009 model year, Yamaha introduced fuel injection on the YZ450F, a significant technological advancement in the motocross class at the time.
Performance Focus:
Designed for maximum power delivery, agile handling, and rider control in competitive racing environments.
Completeness:
Offers a complete reference for maintenance, repair, and parts identification, essential for keeping a high-performance machine in optimal condition.
Primary Coverage:
Workshop Service Repair Manual
Included Manuals:
Parts Catalog, Owner's Manual
Estimated Pages:
High (typically 300+ for workshop, 100+ for parts, 50+ for owner's - specific page count not provided in product info but inferred from comprehensive nature)
Type:
Comprehensive Service, Repair, and Parts Documentation
Format:
Likely Digital (PDF) given typical online sales, but could be printed. Assume searchable digital for maximum utility.
Engine:
Full overhaul, diagnostics, disassembly, assembly, component testing, timing, valve adjustment, cooling system, lubrication.
Fuel System:
Fuel injection system, injectors, fuel pump, fuel filter, throttle body, ECU controls, fuel pressure.
Ignition System:
CDI unit, ignition coil, spark plug, troubleshooting ignition faults.
Transmission:
Clutch operation and adjustment, gearbox disassembly and reassembly, gear inspection, shifting mechanisms.
Electrical System:
Wiring diagrams, component testing, battery, charging system, starter motor, lighting, sensors.
Chassis And Suspension:
Frame inspection, front fork disassembly, seal replacement, rear shock absorber service, linkage lubrication, wheel bearings.
Braking System:
Brake fluid replacement, caliper service, pad replacement, rotor inspection, bleeding procedures.
Bodywork And Trim:
Body panel removal and installation, seat, fuel tank, fairings.
Cooling System:
Radiator service, coolant replacement, thermostat, fan operation.
Maintenance:
Scheduled maintenance, oil changes, filter replacements, chain adjustment, air filter cleaning/replacement.
Troubleshooting:
Diagnostic charts for common problems, fault finding across all systems.
Repair:
Detailed step-by-step repair instructions for all major components and systems.
Rebuilds:
Engine and gearbox overhaul procedures, suspension component rebuilds.
Adjustments:
Carburetor (if applicable in earlier models or variants, though FI is primary), clutch, throttle cable, suspension sag.
Diagnosis:
Engine fault codes (if applicable via diagnostic tools), electrical system checks.
Depth:
Comprehensive: from basic owner maintenance to full engine and transmission rebuilds, including electrical diagnostics and chassis component servicing.
Diagnostic Capabilities:
Includes procedures for diagnosing system failures and specific component issues, likely referencing diagnostic trouble codes (DTCs) if the model is equipped with such capabilities.
Special Tools:
Likely lists necessary special tools for specific procedures (e.g., flywheel puller, suspension seal drivers).
Digital Format:
PDF (assumed for digital delivery)
Searchability:
High (assumed for digital PDF, enabling quick text searches for specific topics)
Illustrations Quality:
High (typical for official or high-quality aftermarket manuals, with clear diagrams and schematics)
Physical Binding:
Perfect bound or spiral bound (if printed)
Physical Paper:
Durable, semi-gloss paper suitable for workshop environments (if printed)
Engine Type:
Liquid-cooled, 4-stroke, DOHC, single-cylinder
Bore X Stroke:
95.0 mm x 63.1 mm (typical for this generation, confirm with manual)
Compression Ratio:
12.3:1 (typical, confirm with manual)
Valve Train:
DOHC, 4 valves
Cooling Method:
Liquid-cooled
Horsepower:
Approx. 53-55 HP (at crank, varies by year and tuning, manual will provide specific figures or range)
Torque:
Approx. 36-38 lb-ft (at crank, varies by year and tuning, manual will provide specific figures or range)
Fuel Delivery:
Fuel Injection (Keihin 44mm throttle body, specific injector details in manual)
Fuel Type:
Unleaded gasoline (91 octane or higher recommended, confirm with manual)
Oil Capacity Engine:
Approx. 1.0 L (confirm specific capacity and type in manual)
Oil Type Recommendation:
Yamaha recommends specific grades, e.g., Yamalube 4 (10W-40) or equivalent API SG or higher, JASO FD, MA rated oil. Manual will specify.
Type:
Constant-mesh 5-speed
Gear Ratios:
Specific gear ratios for each speed are detailed in the manual.
Transmission Oil Capacity:
Approx. 0.8 L (confirm specific capacity and type in manual)
Transmission Oil Type Recommendation:
Yamalube 4 (10W-40) or equivalent API SG or higher, JASO FD, MA rated oil. Manual will specify.
Length:
Approx. 2175 mm (confirm specific dimensions in manual)
Width:
Approx. 825 mm (confirm specific dimensions in manual)
Height:
Approx. 1275 mm (confirm specific dimensions in manual)
Wet Weight:
Approx. 114 kg (with all essential operating fluids and a full fuel tank, confirm in manual)
Dry Weight:
Approx. 106 kg (confirm in manual)
Front Tire Size:
80/100-21 51M (confirm in manual)
Rear Tire Size:
110/90-19 62M (confirm in manual)
Wheel Type:
Spoked wheels
Front Suspension Type:
Upside-down telescopic fork (e.g., KYB Speed Sensitive System, 48mm diameter - specific model details in manual)
Front Suspension Travel:
Approx. 310 mm (confirm in manual)
Rear Suspension Type:
Swingarm (Monocross suspension with KYB shock absorber, link-type, spring-preload adjustable, rebound/compression damping adjustable - specific details in manual)
Rear Suspension Travel:
Approx. 315 mm (confirm in manual)
Infotainment System:
Not Applicable (motocross bike, no infotainment features)
Driver Assistance Features:
Not Applicable (motocross bike, no electronic driver aids like ABS or traction control)
Connectivity Options:
Not Applicable (motocross bike, no Bluetooth or Wi-Fi connectivity)
ECU Mapping:
The manual will detail the ECU's role and may reference options for different performance maps, especially with the advent of EFI. Some models might have dual-map switches or aftermarket tuning capabilities.
Oil Change Interval:
Refer to manual; typically every 10-15 hours of riding or annually, whichever comes first for competitive use.
Air Filter Cleaning:
Regularly, depending on riding conditions (e.g., every few hours in dusty environments). Detailed cleaning and oiling procedures in manual.
Spark Plug Inspection:
As per manual, typically every 20-30 hours or as needed based on performance.
Valve Clearance Check:
Refer to manual; typically every 20-40 hours of riding, critical for engine longevity and performance.
Engine Oil Grade:
10W-40 (Yamalube 4 or equivalent API SG or higher, JASO FD, MA rated)
Coolant Type:
Permanent type anti-freeze coolant (e.g., Yamaha's recommended mixture of 50% distilled water and 50% antifreeze)
Brake Fluid Type:
DOT 4 hydraulic brake fluid (ensure it's from a sealed container)
2009 Efi Tuning:
Early fuel injection systems could sometimes be sensitive to fuel quality or require ECU remapping for optimal performance in specific conditions. Manual will guide on initial setup and potential adjustments.
Clutch Wear:
Like most high-performance dirt bikes, clutch wear can be accelerated by aggressive riding. The manual details clutch inspection and replacement.
Suspension Seals:
Fork seal leaks can occur due to hard impacts or debris; regular cleaning and periodic seal replacement are recommended, covered in the manual.
Yamaha Motorsports:
Yamaha has a long and storied history in motorsports, particularly in motocross, with numerous championships and technological innovations.
Yz450F Development:
The YZ450F has undergone continuous development, with the introduction of fuel injection in 2009 being a major milestone. Subsequent years saw refinements in suspension, chassis, engine mapping, and weight reduction.
Manufacturing Location:
Typically manufactured in Japan or through global production facilities managed by Yamaha.
