2002 Yamaha YZ250(R)/LC Service Manual (583 P.)

Yamaha YZ250(R)/LC Technical Scope

• Covers 2002 Yamaha YZ250(R) and YZ250LC motocross motorcycles, documenting all internal components and chassis assemblies
• Official Yamaha publication P/N 5UP-28199-30
• Includes 105 pages of detailed torque-check points, electrical wiring diagrams, and component-specific maintenance specifications
• Delivered as a direct download the moment payment clears
• Full-text search finds any part number in seconds
• This 583-page manual serves as the primary technical reference for the 5UP-series build, detailing precise clearances and lubrication points necessary for race-ready performance

Component and Systems Documentation

The text details the full maintenance and adjustment procedures for the YZ250 power unit and chassis. Major segments include general information for pre-operation checks, technical data for engine assembly, suspension setups, and electrical system diagnostics. It covers the maintenance intervals, carburetor jetting specifications, and torque sequences for fasteners across the frame, engine mounting, and control assemblies.

Specification Highlights and Reference Data

The manual provides technical depth through its extensive maintenance specification tables. Intake valve clearance is not applicable for this 2-stroke, but piston-to-cylinder clearance is documented at 0.045–0.050 mm. The clutch housing radial clearance is specified between 0.030–0.055 mm. Cylinder head nut torque is listed at 25 Nm (18 ft-lb) in the maintenance section. Ignition timing is set at 0.18 mm B.T.D.C. CDI source coil 1 resistance ranges from 720–1,080 ohms at 20°C. For service, what an OEM service publication covers is vital for proper assembly.

An official 583-page Yamaha OEM service manual covering the 2002 YZ250(R)/LC, documenting engine, chassis, electrical, and tuning specifications for the 5UP-series competition motorcycle build.