Target Audience:
Yamaha YFZ450S owners, DIY mechanics, ATV enthusiasts, repair shops.
Value Proposition:
Provides professional-level repair and maintenance information equivalent to what official dealerships and specialized ATV repair shops utilize, enabling cost savings through DIY repairs.
Unique Selling Points:
Instant download, printable pages, step-by-step instructions, tons of pictures and diagrams, comprehensive coverage.
Objective:
To empower users to repair, maintain, rebuild, refurbish, or restore their 2004 Yamaha YFZ450S ATV Quad effectively.
Primary Coverage:
Comprehensive repair and service for the 2004 Yamaha YFZ450S ATV Quad.
Secondary Coverage:
Maintenance, diagnostics, troubleshooting, rebuild procedures, electrical system, bodywork, chassis.
Estimated Page Count:
Exact page count not provided; typical for this era's comprehensive service manuals can range from 300-600 pages.
Type:
Service Repair Manual
Engine Mechanical:
Engine Removal/Installation, Crankcase, Piston, Cylinder, Crankshaft, Transmission, Balancer, Cylinder Head/Valves, Combustion System, Lubrication System, Cooling System.
Engine Ancillary:
Fuel System (Fuel Injection), Lubrication System, Cooling System, Alternator/Starter Clutch, Electric Starter.
Drivetrain:
Gearbox, Clutch, Transmission System, Crankshaft.
Chassis Suspension Steering:
Front Wheel and Steering System, Rear Wheel System, Suspension, Chassis, Frame.
Braking System:
Braking System (Front and Rear components).
Electrical System:
Electrical System, Battery/Charging System, Ignition System, Lights/Meters/Switches, Wiring Diagrams.
Bodywork And Fixtures:
Fenders and Exhaust Pipe, Body & Fixtures, Frame/Body Panels/Exhaust System.
Wheels And Tires:
Wheels & Tyres.
Maintenance:
Periodic checks & Adjustments, General Maintenance.
Repair And Rebuild:
Complete Engine Rebuild, Transmission Overhaul, Suspension Component Replacement, Electrical Component Diagnosis and Repair, Brake System Servicing.
Diagnostics And Troubleshooting:
Troubleshooting sections, diagnostic procedures for various systems.
Depth:
Comprehensive. Covers everything from basic maintenance to advanced diagnostics and complete rebuild procedures, mirroring professional shop manuals.
Engine Type:
Likely a 5-valve, DOHC, liquid-cooled, four-stroke engine. (Specific displacement mentioned as 450cc class).
Horsepower:
Typically in the range of 40-50 HP for this model and era, precise figures would be in the manual.
Torque:
Specific torque figures not provided, but expected to be robust for a performance ATV.
Fuel Delivery:
Fuel Injection system, as indicated by 'Engine Fuel Injection' and 'Fuel Injection System' sections.
Cooling Method:
Liquid-cooled, as per 'Engine Lubrication and Cooling' and 'Cooling system' sections.
Oil Type:
Specific oil viscosity and API classification would be detailed in the manual (e.g., Yamalube 10W-40 or similar).
Cylinder Configuration:
Single-cylinder.
Transmission Type:
5-speed manual transmission with wet multi-disc clutch.
Optional Gearbox:
N/A for this specific model and year; typically a single transmission offering.
Clutch Operation:
Wet, multi-disc clutch mechanism.
Gear Ratios:
Detailed gear ratios for all five speeds and reverse (if applicable) would be present in the manual.
Transmission Oil Type:
Specific transmission fluid (e.g., Yamalube 4-stroke engine oil, or a dedicated gear oil) and capacity would be specified in the manual.
Overall Length:
Not specified in product info; typical for performance quads of this era is around 70-75 inches.
Overall Width:
Not specified in product info; typically around 45-48 inches for stability.
Overall Height:
Not specified in product info; typically around 40-43 inches.
Dry Weight:
Approximately 350-370 lbs (159-168 kg), actual spec in manual.
Curb Weight:
Not explicitly stated, but would include fluids.
Safety Compliance:
Designed to meet industry safety standards for ATVs; specific ratings not applicable like automotive crash tests.
Braking System Type:
Hydraulic disc brakes front and rear, designed for high performance stopping power.
Throttle Limiter:
May include adjustable throttle stop screws or similar features as per Yamaha's design for varying skill levels, detailed in manual.
Frame Construction:
Robust steel frame for durability and rider protection.
Infotainment System:
N/A - designed purely for performance and off-road capability, no infotainment system is present.
Driver Assistance Features:
N/A - focused on rider input and control, not electronic driver assistance.
Connectivity Features:
N/A - no Bluetooth, Wi-Fi, or other connectivity features.
Headlight Type:
Standard halogen headlights, possibly dual or triple setup, with a brake light.
Oil Change Interval:
Typically every 1000-2000 miles or annually, specific interval detailed in the manual based on usage.
Air Filter Cleaning:
Recommended cleaning/replacement at regular intervals, especially after dusty riding conditions; detailed in manual.
Spark Plug Replacement:
Intervals would be specified, typically based on hours of operation or mileage.
Engine Oil Grade:
Likely Yamalube 4-stroke ATV oil or a comparable SAE 10W-40 or 20W-50 API SG or higher, as specified in the manual.
Coolant Type:
A permanent type antifreeze (ethylene glycol based) with corrosion inhibitors, typically a 50/50 mix with distilled water, as per manual.
Common Wear Items:
Chain and sprockets, brake pads and rotors, wheel bearings, and tires are common wear items on performance ATVs; manual provides wear limits and replacement procedures.
Carburetor Vs Fi:
This model features Fuel Injection, simplifying tuning and improving throttle response compared to carbureted models of the era.
Manufacturer:
Yamaha Motor Corporation, a globally recognized leader in powersports and audio equipment, known for performance and reliability.
Yzf Series Introduction:
The YFZ450 was introduced as Yamaha's flagship sport ATV, heavily influenced by their YZ motocross bike technology, quickly becoming a dominant force in racing.
Production Era:
The first generation YFZ450, including the 2004 model, was a groundbreaking ATV that defined the high-performance sport quad segment.
Racing Dominance:
The YFZ450 platform has a storied history of success in professional ATV racing, winning numerous championships in various disciplines.
Performance Reviews:
Consistently praised by enthusiasts and media for its powerful engine, sharp handling, and competitive performance upon its release.
Industry Standards:
Manufactured to meet global safety and emission standards applicable to off-road vehicles.
