Comprehensive Owner's Manual and Service Guide for Yamaha YZ490L Motocross Motorcycle 1984
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Models Covered & Key Technical Specifications
Yamaha Motor Corporation, Ltd
- YZ490L (1983-1984)
- YZ 490 L (1983-1984)
Professional Workshop Service Manual & Technical Specifications
Professional Service Manual for 1984 Yamaha YZ490L Motocross Legend
Master the maintenance and repair of your high-performance racing machine with this comprehensive technical guide. Specifically designed for the 1984 Yamaha YZ490L, this manual is the ultimate resource for competitive riders and vintage motocross enthusiasts who demand peak performance from their air-cooled open-class powerhouse.
The Yamaha YZ490L is a cornerstone of 1980s motocross history, known for its massive 487cc 2-stroke engine and the innovative Monocross suspension system. Whether you are performing a complete engine overhaul or fine-tuning the Mikuni VM40SS carburetor for race day, this manual provides the exact specifications and step-by-step procedures required to keep your "Yellow Screamer" at the front of the pack.
Targeted Model Coverage
- YZ490L (1983-1984)
- YZ 490 L (1983-1984)
Quick Identification Specs
To ensure you are using the correct data for your specific bike, verify your serial numbers:
- Vehicle Identification Number (VIN): Located on the right side of the steering head pipe (Starting Serial: JYA40T00EA000101).
- Engine Serial Number: Stamped on the elevated part of the right rear section of the engine (Starting Serial: 40T-000101).
- Model Code: 40T
Inside This Comprehensive Manual
Engine & Drive Systems Get detailed instructions for the 487cc torque-induction engine. This section covers the critical piston-to-cylinder clearances (Standard: 0.080–0.085 mm), reed valve inspection, and the Yamaha Energy Induction System (Y.E.I.S.). It includes full tear-down and reassembly guides for the 4-speed constant mesh transmission and the wet multi-disc clutch.
Advanced Chassis & Suspension Tuning The YZ490L featured the "De Carbon" system Monocross rear suspension. This manual provides specific gas pressure settings (Standard: 171 psi) and damping adjustments to tailor
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