1984 Yamaha YZ490L Owner's Manual and Service Guide

This 1984 YZ490L technical guide provides essential information for operation and basic maintenance. It details features, controls, and inspection items for your Yamaha motorcycle. PN LIT-11626-04-25.

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Document Details

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Document Number / Seller:
26565 / Barbara Rodriguez
File Size:
13.66 MB
File Type:
ZIP
Language:
English
Printable:
Yes
Category:
Bike
Last updated / verified
Jun 30, 2025

Models Covered & Key Technical Specifications

Detailed Performance Shop Manual: Yamaha YZ490L Owner's Manual and Service Guide 1984 Standards-Vault

Consolidated Primer for Mechanical Vault // Unit-Designations: YZ490L / Motorcycle Logic // Technical-Domain: Manuals & Reference Data. Calibrated Footprint Data: 110.5 kg establishes the base weight with oil and full fuel capacity Framework. Rated Imaging Specs: For optimal operation, 28°30′ defines the steering head angle parameters. Published Tightening Data: The primary drive gear requires 115 Nm -- signifies the active assembly torque Threshold. Authorized Gap Specs: The piston rings require 0.35~0.50 mm for standard operation Logic. Maximum Power Draw: The engine type is air-cooled 2-stroke, gasoline, torque induction Standards. Documented Component Weight: The oil capacity is 550 cm³ enables proper fork damping performance Matrix.

Professional Workshop Service Manual & Technical Specifications

Detailed Performance Shop Manual: Yamaha YZ490L Owner's Manual and Service Guide 1984 Standards-Vault

Consolidated Primer for Mechanical Vault // Unit-Designations: YZ490L / Motorcycle Logic // Technical-Domain: Manuals & Reference Data. Top Assessment-Parameter Rating Context
Model Code Number 40T Vehicle Identification
Engine Starting Number 40T-000101 Engine Identification
Overall Length 2,175 mm Vehicle Dimension
Engine Type Air, cooled 2-stroke, gasoline, torque induction Powertrain Specification
Carburetor Type/Manufacturer VM40SS/MIKUNI Fuel Delivery System

Major sections focus on General Information, Regular Maintenance and Adjustments, Engine Maintenance and Repair, Chassis Maintenance and Repair, Electrical Troubleshooting, and Appendices, offering a comprehensive overview of the YZ490L.

OEM guidelines are included for machine identification, control functions, and preoperation checks, ensuring proper setup.

Transmission service information covers gear ratios, drive types, and operational details for smooth shifting.

HV AC system procedures are included for carburetor tuning, Y.E.I.S., and reed valve maintenance.

Torque specifications are documented for critical engine and chassis components to ensure secure assembly.

Parts identification is covered for cylinder head, cylinder, piston assembly, and clutch components.

This manual details torque specifications for critical components like the cylinder head and crankcase, crucial for vibration dampening and preventing leaks.

FAQ

What procedures are **necessary** for ignition system troubleshooting, including spark plug resistance values? keyboard_arrow_down

3100±10% at 20°C (68°F) is the source coil resistance (Brown - Black) for the CDI magneto, essential for proper ignition system function.

Determine the **recommended** calibration settings for the carburetor jets. keyboard_arrow_down

440 is the standard Main Jet size for the VM40SS/MIKUNI carburetor, though adjustments may be needed for performance at different altitudes.

What **calibrated** clearance measurements are specified for the piston rings and cylinder bore? keyboard_arrow_down

0.35~0.50 mm (0.014~0.020 in) is the installed end gap for the piston rings, and the cylinder bore has a taper limit of <0.08 mm (0.0031 in).

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Reviews (2)

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Rated 4 out of 5 stars
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This manual is a lifesaver for maintaining my 1984 YZ490. The download was smooth, and I received the link in no time after purchase. Highly recommend!