Yamaha YZ426F(N)/LC Maintenance & Service Manual

Yamaha YZ426F 2001–2002 Service Manual

• Covers 2001–2002 Yamaha YZ426F, YZ426FLC, and YZ426FN motocross motorcycles.
• Original OEM publication P/N 5JG-28199-81.
• Includes 12 wiring diagrams, 27 torque tables for engine and chassis fasteners, and 9 exploded-view assembly diagrams.
• Instant download delivery the moment your payment clears.
• High print resolution preserves critical exploded-view details for bench work.
• This 200-page factory manual provides the exact clearance, capacity, and tolerance data required for professional-grade 4-stroke maintenance.

Contents Overview

Organized into seven specific sections, this official manual documents every major engine and chassis system. The content flows logically from general machine identification and prep work right into the heavy lifting: transmission teardowns, lubrication routes, cooling setups, and electrical diagnostics. You also get detailed frame construction specs, steering geometry, and suspension tuning baselines. This layout saves time on the bench, giving you fast access to the exact data needed for your current rebuild.

Technical Highlights

Real workshop efficiency relies on precise figures. Engine data includes intake valve clearance specified at 0.10–0.15 mm and exhaust valve clearance at 0.20–0.25 mm. The piston-to-cylinder clearance for the 426 cm³ engine is tight, documented between 0.040 and 0.065 mm. Main engine oil capacity is 1.5 L for standard periodic changes, increasing to 1.6 L when swapping the filter.

The manual also outlines a 12.5:1 compression ratio and provides comprehensive charts for tightening torques, such as the 44 Nm requirement for cylinder head M10 bolts. Keep in mind that handling high-performance race engines involves inherent risks. The data provided here serves as a reference overview; always rely on the full specifications within the manual and standard shop safety protocols before beginning any hands-on wrenching.

Document Reference: 5JG-28199-81