🏷️ Basic Information

Make:

Yamaha

Model:

YFZ450

Model Variant:

YFZ450S

Model Years Covered:

2003, 2004, 2005, 2006, 2007, 2008, 2009

Vin Decoder Note:

Specific VIN decoding information not provided in product details, but manual covers specified model years.

👋 Introduction

Segment:

High-Performance Sport ATV

Target Audience:

Enthusiasts, racers, and DIY mechanics focused on performance and customization.

Key Competitors:

Honda TRX series, Suzuki LT-R series, Kawasaki KFX series.

Manual Value Proposition:

Provides comprehensive, official factory data for accurate diagnostics, maintenance, and repairs, enabling owners to maintain peak performance.

Delivery Benefit:

Instant download eliminates shipping delays and costs, providing immediate access to critical repair information.

📋 Manual Details

Coverage Scope:

Complete OFFICIAL Factory Service / Repair / Full Workshop Manual

Total Pages:

375

Type:

Service Manual, Repair Manual, Workshop Manual

Primary Language:

English

Delivery Format:

PDF Download

📖 Manual Coverage

Engine Mechanical:

Yes (Cylinder Head, Block, Pistons, Rings, Rods, Crankshaft, Valve train, Camshaft, Carburetor, Oil Pump, Oil Pan, Timing Gears, Valve Locks, Freeze Plugs)

Fuel System:

Yes (Carburetor Assembly, Fuel Pump, Fuel Filter, Fuel Injector, Fuel Screen, Fuel Pipe, Fuel Tank Cap, Fuel Filler Neck)

Ignition System:

Yes (Ignition, Spark Plugs, Spark Plug Wires, Ignition Coil, Ignition Relay)

Cooling System:

Yes (Radiator, Radiator Fan, Oil Radiator, Oil Cooling, Coolant Hose, Fan Shroud, AC Condenser)

Exhaust System:

Yes (Muffler, Downpipe, Cat, Catalytic Converter, Exhaust, Headers, Manifold, Exhaust Gasket)

Clutch System:

Yes (Clutch, Clutch Shoe, Clutch Case, Clutch Kit, Clutch Slave Cylinder, Clutch Master Cylinder, Clutch Lines, Pressure Plate, Flywheel)

Transmission Drivetrain:

Yes (Transfercase, Transfer Case, Transfer Plate, Axles, Axle Assembly, Axle Shafts, CV Boots)

Brakes:

Yes (Brakes, Change Brakes, Brake Pads, Brake Shoes, Rotor, Rotor Replacement, Brake Discs, Brake System)

Suspension Steering:

Yes (Suspension, Suspension System, Steering System, Shocks, Struts)

Wiring Harnesses:

Yes (Engine Harness, Wiring Harness, Chassis Wire Harness, Main Wire Harness, Wiring Diagrams, Electrical Wiring)

Sensors Controls:

Yes (Sensors, Oil Sensor, Pressure Sensor, Oil Pressure Sensor, Oxygen Sensor, Door Jamb Switch)

Lighting:

Yes (Interior Lighting, Lights, HID, Projector, Headlight Replacement, Taillight Replacement, Bulb Replacement, Fogs, Foglight, Foglight Replacement, Third Brake Light, Driving Lights, Fog Lights, Interior Lights, Lighting, Tail Lights, Backup Lights, Turn Signal, Side Markers, Headlight Relay, Starter Relay, Ignition Relay)

Starting Charging:

Yes (Alternator, Alternator Pulley, Starter, Recoil Starter, Starter Replacement, Battery, Battery Replacement)

Exterior Panels:

Yes (Air Deflector, Air Hose, Clutch Hose, Brake Hose, Air Seals, Fan Cover, Filter Cover, Filter Housing, Sleeve, Bumper, Front Bumper, Rear Bumper, Fender, Doors, Emblem, Fuel Cap, Fuel Door, Grilles, Front Grille, Hood, Mud Guards, Mud Flaps, Trim, Trim Replacement, Turn Signal)

Interior Components:

Yes (Dashboard, Dash Replacement, Air Bags, CD Player Replacement, Glovebox, Center Console, Console Replacement, Floor Mat, Cargo Liners, Consoles, Organizers, Leather, Steering Wheel, Shifter, Pedals, Hub Caps, Wheel Cover)

Glass Wipers:

Yes (Glass, Window, Windshield, Wiper Blade, Wiper Motor, Washer Pump)

Maintenance:

Yes (Oil Change, Transmission Change, Fluid Change, Air Filter Replacement, Fuel Filter Replacement, Brake Change, Tire Rotation)

Repair:

Yes (Complete engine rebuild, transmission overhaul, brake system repair, suspension and steering system service, electrical component replacement, body panel repair and replacement)

Troubleshooting:

Yes (Diagnostic procedures, fault finding, electrical system troubleshooting)

Installation:

Yes (Component installation, accessory fitting guidance implied by factory specifications)

Depth:

Comprehensive Factory Workshop Manual covering all aspects of repair and maintenance.

Special Procedures:

Yes (Machining, Balancing, Torque Specs, Torque Values, Alignment)

📊 Manual Specifications

Format:

PDF

Searchability:

Keyword Searchable

Zoom Functionality:

Yes (Zoom In/Out)

Printability:

Yes (Printable)

Quality:

Factory Quality

Binding:

N/A (PDF Download)

Paper:

N/A (PDF Download)

⚙️ Engine Specifications

Configuration:

Liquid-cooled, DOHC, 5-valve, Four-stroke Single

Displacement:

449cc

Bore X Stroke:

95.0 mm x 63.1 mm

Compression Ratio:

11.2:1 (typical, may vary slightly by year)

Horsepower Est:

Approx. 40-45 HP (stock, may vary)

Torque Est:

Approx. 30-33 lb-ft (stock, may vary)

Carburetor:

Mikuni BSR33/1 (typical, may vary by year)

Fuel Type:

Unleaded gasoline, 87-91 octane recommended

Oil Capacity:

Approx. 1.90 L (with filter change)

Oil Type:

Yamalube 4 (or equivalent) SAE 10W-30 API SG or higher

Type:

Forced liquid cooling

🔧 Transmission

Type:

5-speed constant mesh with reverse

Clutch Type:

Wet multi-plate

📐 Dimensions

Length:

Approx. 1,845 mm (72.6 in)

Width:

Approx. 1,240 mm (48.8 in)

Height:

Approx. 1,055 mm (41.5 in)

Dry Weight:

Approx. 179 kg (395 lbs)

Fuel Capacity:

Approx. 10 L (2.6 gal)

🛡️ Safety Features

Crash Test Data:

N/A (ATV, not subject to standard automotive crash testing)

Braking System:

Hydraulic disc brakes front and rear.

Hand Guards:

Integrated hand guards for rider protection.

💡 Technology Features

Features:

Basic instrumentation (speedometer, odometer, engine hour meter, neutral indicator). No advanced infotainment systems.

Features:

No electronic driver assistance features. Focus is on raw performance.

Features:

No Bluetooth or Wi-Fi connectivity.

🔧 Maintenance

Oil Change Interval:

Every 10 hours of operation or monthly, whichever comes first (refer to manual for exact specifications).

Air Filter Cleaning:

Recommended every 5 hours of operation or after dusty rides.

Spark Plug Replacement:

Refer to manual for mileage/hour-based recommendations.

Coolant Type:

Yamaha Silicone Coolant (or equivalent) pre-mixed 50/50 with distilled water.

Brake Fluid:

DOT 3 or DOT 4.

Carburetor Tuning:

Carburetor jetting and adjustment can be critical for optimal performance, especially at different altitudes or with aftermarket modifications. Manual covers precise tuning procedures.

Camchain Tensioner:

Some models may experience wear on the cam chain tensioner; manual provides inspection and replacement guidelines.

Valve Adjustment:

Regular valve lash adjustments are crucial for engine longevity and performance. Manual details the precise procedure and specifications.

📚 Vehicle History

Yamaha Legacy:

Yamaha has a long and successful history in motorsports, particularly with performance motorcycles and ATVs.

Yfz450 Intro:

The YFZ450 was introduced in 2004 as Yamaha's flagship sport ATV, featuring a lightweight aluminum frame and a powerful 450cc engine derived from their motocross bikes.

Year Updates:

Minor revisions and updates occurred throughout the 2003-2009 model years, primarily in suspension tuning, graphics, and some internal engine components. The manual covers these specific factory variations.

Manufacturing Location:

Primarily manufactured in Japan, with some components sourced globally.

🏆 Awards & Recognition

Motorsports Success:

The YFZ450 platform has a strong record of success in professional ATV racing and championships.

Consumer Reviews:

Consistently rated highly by enthusiasts for its power, handling, and racing pedigree.