Target Audience:
Yamaha YFZ450S owners, DIY mechanics, repair shops.
Value Proposition:
Provides professional-grade repair and maintenance information, enabling cost savings on labor.
Instant Access:
Immediate download eliminates shipping costs and wait times.
Vendor Support:
Email support available for manual-specific questions.
Engine:
Detailed coverage of engine assembly, disassembly, diagnostics, and repair.
Cooling System:
Comprehensive information on radiator, coolant, water pump, and related components.
Fuel Injection System:
In-depth analysis of fuel pump, injectors, throttle body, sensors, and ECU.
Electrical System:
Wiring diagrams, component testing, ignition system, lighting, and battery.
Chassis:
Suspension (front & rear), steering system, wheels, tires, and brakes.
Troubleshooting:
Systematic diagnostic procedures for common and uncommon issues.
Maintenance:
Scheduled maintenance, oil changes, filter replacements, adjustments.
Diagnostics:
Troubleshooting guides for electrical, fuel, engine, and chassis problems.
Repairs:
Step-by-step instructions for component replacement and system repair.
Adjustments:
Valve clearance, carburetor settings (if applicable), brake adjustments, clutch adjustments.
Depth:
Comprehensive from basic checks to complete engine rebuilds.
Visuals:
Abundant pictures and diagrams for clarity.
Usability:
Easy to follow, step-by-step instructions suitable for all skill levels.
Bore X Stroke:
95.0 mm x 63.4 mm
Compression Ratio:
11.2:1
Horsepower:
Approximately 40-45 hp (estimated, actual may vary based on specific tuning and dyno tests)
Torque:
Approximately 30-33 lb-ft (estimated)
Fuel Delivery:
Fuel Injection (Yahama's 'Mikuni' or similar EFI system for the era)
Fuel Type:
Unleaded gasoline, minimum octane rating of 87
Valve Train:
DOHC, 5 valves
Oil Change:
Every 30 hours or 6 months (whichever comes first), with filter every other oil change or 60 hours.
Air Filter:
Inspect and clean every 15 hours, replace as needed.
Spark Plug:
Check and clean every 30 hours, replace as needed (refer to manual for specific gap and type).
Valve Clearance:
Every 60 hours or 12 months.
Engine Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40 API SG or higher, JASO MA certified motorcycle oil.
Coolant Type:
High-quality ethylene glycol-based coolant, 50/50 mixture with distilled water.
Common Wear Items:
Brake pads, tires, chain and sprockets, clutch plates, wheel bearings.
Engine Performance Tips:
Regular maintenance of the fuel injection system, air filter, and spark plug is critical for optimal performance.
Manufacturer:
Yamaha Motor Corporation, a renowned Japanese manufacturer of motorcycles, marine products, and power sports equipment.
Yfz450 Introduction:
The YFZ450 platform was introduced as a game-changer in the sport ATV market, known for its potent engine and agile chassis.
2005 Model Updates:
While specific major overhauls for 2005 are not detailed, Yamaha typically refined suspension, engine tuning, and aesthetics in its model years.