2001-2006 Yamaha YZ250LC, YZ250N1, and YZ250(N) Service Manual (P/N 5MW-28199-30)

The official 2001–2006 Yamaha YZ250 service manual (P/N 5MW-28199-30) delivers the exact factory-specified technical data and procedural framework needed for competition-focused maintenance. Designed for experienced riders and professional workshop environments handling 5MW-series motocross machines, it covers the YZ250 chassis and liquid-cooled 2-stroke powerplant in depth.

• Covers 2001–2006 Yamaha YZ250LC, YZ250N1, and YZ250(N) models, breaking down regional variants for the USA, Canada, Europe, Australia, and New Zealand.
• Contains 88 pages of authentic OEM documentation, first published in July 2000.
• Provides detailed exploded-view assembly diagrams, extensive maintenance specification charts, and comprehensive torque-check tables.

Essential Workshop Data and Maintenance Framework

This publication maps out operational, inspection, and maintenance procedures for the entire 2001–2006 YZ250 lineup. It details core component tear-downs across the transmission, ignition, and fuel systems. The manual also provides crucial identification data, locating the exact model label alongside frame and engine serial numbers.

The exploded views illustrate the proper sequence for disassembly and reassembly stages. To speed up your time on the bench, the diagrams clearly mark critical grease points and strict torque requirements. This eliminates guesswork during complex mechanical overhauls.

Specification Highlights

Performance metrics and exact wear limits are laid out for major engine and chassis systems. Combustion chamber capacity sits at 21.5 cm³, while the cylinder head warp limit is strictly 0.03 mm. The periodic engine oil change requires 0.75 liters. To keep the driveline dialed in, drive chain slack must be maintained between 40 and 50 mm. The cooling system holds 1.20 liters.

You will find a dedicated torque table supplying bolt-specific values to ensure structural integrity. The cylinder head nuts require 25 Nm. The primary drive gear needs 55 Nm, and the clutch boss nut demands 75 Nm. Working with compressed suspension components and high-torque engine internals carries inherent physical risks. Mechanics should always rely on the complete factory values found within this documentation to safely secure components and verify tolerances before returning the bike to the track.