Owner's Service Manual for Yamaha YZ250(M)/LC, YZ250LC, YZ250M1 Competition Motocross models, 2000 edition, PDF

2000 Yamaha YZ250(M)/LC Owner's Service Manual - Professional Competition Support

Maximize the performance and reliability of your 2000 Yamaha YZ250 with this comprehensive Owner's Service Manual. Designed specifically for the high-performance YZ series, this manual is the ultimate resource for professional mechanics and dedicated riders who demand peak performance from their competition motocross machines. Whether you are maintaining a US-spec YZ250M1 or an international YZ250LC model, this document provides the technical depth required for precision tuning and full-scale overhauls.

This manual covers the following model combinations:

• YZ250(M)/LC (2000)
• YZ250LC (Europe) (2000)
• YZ250M1 (USA) (2000)
• YZ250(M) (CDN, AUS, NZ, ZA) (2000)

Detailed Technical Insights and Model Specifications

The 2000 YZ250 is a pacesetting racing machine, featuring a liquid-cooled 2-stroke engine with a 249cc displacement and a high-performance Keihin PWK38S carburetor. This manual provides exact specifications that differ between regional models, such as the specific carburetor settings for the USA (#175 Main Jet) versus European configurations. It also includes vital data for the constant-mesh 5-speed transmission and the sophisticated link-type Monocross rear suspension system.

Machine Identification for Parts Ordering

To ensure you order the correct spare parts, this manual provides precise locations for all serial numbers:

• Vehicle Identification Number (VIN): Stamped on the right side of the steering head pipe (for USA, CDN, AUS, NZ, and Europe).
• Frame Serial Number: Located on the right of the steering head pipe (for France, Germany, UK, Italy, and South Africa).
• Engine Serial Number: Stamped into the elevated part of the right-side engine case.
• Model Label: Affixed to the frame under the rider's seat, containing the specific model code (e.g., 5HC1, 5HC2, or 5HC4).

Expert Maintenance and Competition Tuning

The 2000 edition focuses heavily on the requirements of a competition-use machine. It includes dedicated sections for:

• Engine Overhaul: Complete procedures for the cylinder head, piston, and crankshaft maintenance.
• YPVS System: Detailed service instructions for the Yamaha Power Valve System governor and linkage.
• Chassis Precision: Service limits for the 46mm telescopic forks and the rear shock absorber, including nitrogen gas pressure specifications (1,000 kPa / 142 psi).
• Electrical Diagnostics: Full data for the CDI magneto system, including source and pickup coil resistance values.
• Tuning for Excellence: Specialized "Tuning" chapter to help you adjust your machine's settings based on track conditions and rider preference.

What’s Included in This Manual

This digital resource is organized into seven major chapters for quick navigation:

1. General Information (Machine ID, Special Tools, Control Functions)
2. Specifications (General, Maintenance, and Torque Specs)
3. Regular Inspection and Adjustments (Periodic Maintenance)
4. Engine (Overhaul, YPVS, Carburetion, Cooling System)
5. Chassis (Forks, Shock, Brakes, Wheels)
6. Electrical (Ignition System, Wiring Diagrams)
7. Tuning (Engine and Chassis optimization)

With detailed exploded diagrams and step-by-step instructions, this manual eliminates guesswork. From initial break-in procedures (using a 15:1 mixing ratio) to standard race-ready premix settings (30:1 with Yamalube 2-R), every detail is covered to keep your YZ250 at the front of the pack.