2002 Yamaha YZ250(P)/LC Owner's Service Manual (P/N 5NX-28199-30, 1st Edition)

• Official 100-page Yamaha OEM publication (P/N 5NX-28199-30, 1st Edition June 2001) for the 5NX-series build
• Covers 2002 Yamaha YZ250 motocross competition bikes, specifically the YZ250P1 and YZ250LC variants
• Features 124 exploded-view diagrams, 2 technical schematic pages, and 7 detailed torque specification tables
• Details engine, chassis, electrical, and fuel system baseline factory specifications
• Documents maintenance standards required for the 2002 model year release

Technical Reference and Content Overview

This official workshop manual provides the comprehensive technical data mechanics need for routine maintenance and full structural inspections of the 2002 YZ250. The documentation outlines essential operational features, starting procedures, and exact maintenance intervals across all systems. You get the hard numbers necessary to service everything from the liquid-cooled 2-stroke powerplant to the link-type monocross suspension. Please remember that working on high-performance competition motorcycles carries inherent risks; always ensure the bike is properly secured on a stand and depressurize systems before beginning any inspection to prevent injury.

Specification and Assembly Data

Accurate assembly demands precise numbers, and this publication delivers. Detailed torque tables list the exact tightening force required for all engine, chassis, and electrical components. You will find critical reference values for engine work, including compression ratios of 9.1–10.6:1 and piston clearance standards of 0.045–0.050 mm. The manual also documents exact fluid capacities, such as the 1.20-liter coolant volume and 0.80-liter transmission oil total, taking the guesswork out of regular maintenance. This data structure mirrors exactly what factory technicians rely on to keep these machines race-ready.