Yamaha YZ426F(N)/LC Maintenance & Service Manual
Technician-level documentation for YZ426F motocross models with complete engine service, chassis inspection, electrical diagnostics, and repair procedures for competition applications.
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Yamaha Models Covered & Key Technical Specifications
Models: Yamaha YZ426F, YZ426FLC, YZ426FN
Sub-models / Variants: 4-stroke, DOHC, liquid-cooled, motocross
Build Years: 2001–2002
Serial Numbers: 5JG5 (USA), 5JG6 (EUROPE), 5JG8 (CDN, AUS, NZ, ZA)
Technical Data:
- Engine displacement: 426 cm³
- Compression ratio: 12.5:1
- Engine type: Liquid cooled 4-stroke, DOHC, single cylinder
- Starting system: Kick starter
- Transmission: Constant mesh 5-speed
- Fuel tank capacity: 8.0 L (2.11 US gal)
- Dry weight: 113.0 kg (249 lb)
Yamaha Manual Features & Content Preview
Yamaha YZ426F 2001–2002 Service Manual
- Covers 2001–2002 Yamaha YZ426F, YZ426FLC, and YZ426FN motocross motorcycles, documenting engine, chassis, electrical, and tuning specifications
- Original OEM publication P/N 5JG-28199-81
- Includes 12 wiring diagrams, 27 detailed torque tables for engine and chassis fasteners, and 9 exploded-view assembly diagrams
- File delivered as a direct download the moment payment clears
- Print resolution preserves exploded-view detail
- This 200-page factory publication provides the official clearance, capacity, and tolerance data required for professional-grade 4-stroke maintenance and rebuilds
Contents Overview
This official service manual is organized into seven sections, documenting procedures for engine and chassis systems. Content flows from general machine identification, preparation, and cleaning, through specific data for transmission, lubrication, cooling, and electrical components. The document covers frame construction, steering geometry, and detailed suspension setups, ensuring accurate maintenance of what an OEM service publication covers.
Technical Highlights
Engine data includes intake valve clearance specified at 0.10–0.15 mm and exhaust valve clearance at 0.20–0.25 mm. Piston-to-cylinder clearance for the 426 cm³ engine is documented between 0.040 and 0.065 mm. Main engine oil capacity is specified at 1.5 L for periodic changes and 1.6 L when the oil filter is replaced. The manual documents a 12.5:1 compression ratio and provides detailed charts for tightening torques, such as 44 Nm for cylinder head M10 bolts. Note: All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. This 200-page OEM Yamaha service manual provides complete technical specifications and maintenance procedures for the 2001–2002 YZ426F series, documenting engine, chassis, and electrical system requirements for racing-grade performance.
Document Reference: 5JG-28199-81
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