Yamaha YZ450F(B) YZ450F Owner's Service Manual (2012)

Yamaha YZ450F(B) Owner's Service Manual 2012

Keeping a high-performance racing machine like the 2012 Yamaha YZ450F in peak condition requires more than just basic knowledge—it requires the exact factory specifications and step-by-step procedures used by professional mechanics. This Owner's Service Manual is the definitive resource for the YZ450F(B) and YZ450F models, specifically designed for those who demand excellence from their competition motorcycles.

This manual isn't just a guide; it’s a comprehensive technical breakdown of the bike that revolutionized the 450 class with its rearward-slanted cylinder and bilateral beam frame. Whether you are performing a simple oil change or a complete engine overhaul, this document provides the clarity and technical depth needed to ensure your Yamaha remains a leader on the track.

Comprehensive Model Coverage

This manual is specifically tailored for the following 2012 model combinations:

• YZ450FB (2012)
• YZ450F (2012)

To ensure you are using the correct data for your specific region, refer to these Model Code Numbers found in the manual:

• 33D9: USA and Canada
• 33DA: Europe
• 33DC: Australia, New Zealand, and South Africa

Vital Identification & Serial Numbers

For precise parts ordering and security, this manual guides you to the exact locations of your machine's unique identifiers:

• Vehicle Identification Number (VIN): Stamped on the right side of the steering head pipe.
• Engine Serial Number: Located on the elevated part of the right side of the engine.
• Model Label: Affixed to the frame directly under the rider's seat.

Detailed Chapter Breakdown

1. General Information: Safety labels, special tools, and fundamental control functions.
2. Specifications: Exhaustive technical data, from tightening torques to engine dimensions.
3. Regular Inspection and Adjustments: Maintenance intervals and pre-operation checklists.
4. Engine: Sequential instructions for the cylinder head, camshafts, clutch, and crankshaft.
5. Chassis: Complete service for the front forks, rear shock, and braking systems.
6. Fuel System: Deep dive into the fuel pump and throttle body assembly.
7. Electrical: Wiring diagrams and troubleshooting for the FI (Fuel Injection) system.
8. Tuning: Professional advice on suspension settings and gear ratio selection.

Key Technical Highlights

• FI System Mastery: Detailed outline of the Electronically Controlled Fuel Injection system, including sensor voltage checks and injector maintenance.
• Advanced Suspension Tuning: Specific procedures for adjusting the KYB Speed Sensitive System front forks and the Link-type Monocross rear suspension to match track conditions.
• Torque-Check Points: A dedicated section highlighting critical fasteners that must be checked after break-in or before every race.
• Exploded Diagrams: High-quality visual aids for every removal and disassembly task, ensuring parts are reinstalled correctly every time.

Pro-Level Maintenance & Value

This manual provides the exact Service Limits for components like piston ring gaps, valve clearances (Intake: 0.10–0.15 mm; Exhaust: 0.20–0.25 mm), and friction plate thickness. By following the factory-recommended maintenance intervals—such as replacing the engine oil every race (approx. 2.5 hours)—you protect your investment and ensure maximum power delivery.

Designed for both seasoned race mechanics and dedicated owners, this manual demystifies the 449.7cc liquid-cooled 4-stroke engine, allowing you to maintain the highest grade of craftsmanship and reliability that Yamaha is known for. Secure your riding experience and get the most out of your 2012 YZ450F with this essential service companion!