Honda XL400R & XL500R (1982) Shop Manual Addendum (P/N 6643500Y)

This 1982 Honda XL400R and XL500R shop manual addendum (P/N 6643500Y) is the factory Section 22 supplement. Shared service and repair procedures require the separate base shop manual. Honda also directs readers to the base manual for XL400R F-type service.

ZIP Contents and Wiring Diagram Readability

Text search and wiring detail: The PDFs lack searchable text and embedded bookmarks. Small labels in the main wiring diagram require zooming, and some wire and connector markings remain faint even when enlarged.

The ZIP contains seven printable PDFs totaling 100 pages, including 98 addendum pages and the front and back covers. The service procedures are in English, with multilingual cover text, section indexes, and diagram labels.

Carburetor, Chassis, and Electrical Service

This selection of service topics highlights the main procedures. The addendum also shows fuel strainer cleaning and headlight and instrument removal.

• Carburetor service: Step-by-step teardown and reassembly for the PD78A and PD75A, including accelerator pump service and adjustment, jet and float inspection, pilot-screw idle-drop setup, and fast-idle adjustment.

• Cylinder head and clutch: Cylinder head cover removal and installation, cam sprocket timing, automatic cam chain tensioner handling, clutch spring specifications, and pulse generator rotor removal and installation.

• Front wheel, brake, and steering: Wheel bearing service, two-leading-shoe front brake disassembly and synchronization, fork teardown and seal replacement, and steering stem bearing and race service.

• Rear wheel and Pro-Link suspension: Rear hub and driven-flange bearings, rear brake service, shock removal and preload setup, plus shock arm, shock link, and swingarm pivot bearing service.

• Charging and ignition: Charging output tests, regulator/rectifier and AC regulator checks, AC generator stator replacement, and tests for the ignition coil, exciter coil, CDI unit, and pulse generator.

• Switches and wiring: Continuity tables for the ignition, handlebar, front stoplight, and engine stop switches, with system schematics and a two-page main wiring diagram.

The addendum suits mechanics and mechanically qualified owners who have the base shop manual and the specified tools. Honda recommends dealer service for certain maintenance items.

Model Differences, Fuel System, and Engine Work

The specification tables distinguish the two engine builds, carburetor configurations, final-drive ratios, drive chains, and full-advance ignition settings. A revised maintenance schedule, lubrication chart, engine and frame torque tables, fluid specifications, and wear limits support the service procedures.

The cable and harness routing views identify market-specific clamp locations and the XL500R-only manual decompressor cable. Honda gives separate adjustments for the XL500R's hand-operated and kickstarter decompression controls and refers XL400R starter decompressor adjustment to the base manual.

During carburetor overhaul, the fuel section calls out wear and deposits at the float valve and seat, along with cracks or brittleness in the accelerator pump diaphragm. It also covers passage cleaning and warns that forcing the pilot screw against its seat can damage the seat.

The cylinder head section shows the cam sprocket index marks, tensioner wedges, valve timing checks, and cover sealing. A sectional view explains how the automatic tensioner takes up chain slack. Engine removal and valve clearance procedures are covered in the base manual.

Brake Synchronization and Suspension Setup

The fork assembly view identifies the oil seal and circlip, and the procedure covers oil level and fork alignment. Honda warns that turning the front brake connecting rod during routine service can upset brake cam synchronization and reduce stopping power. The brake section shows the punch marks used to index the arms.

At the rear, the Pro-Link assembly views identify the linkage pivots and the bearings and bushings that need inspection or lubrication. The gas-filled damper stays sealed during service. Honda calls for replacement as a unit if it leaks, is damaged, or falls below the compression-force limit.

Electrical Troubleshooting and Factory Tools

The no-spark troubleshooting chart helps narrow a fault to wiring, switches, or ignition components before parts are replaced. The charging section includes a separate schematic for German and Swedish versions. The CDI circuit and waveform charts explain electronic ignition advance.

The main wiring diagram uses drawing references 0030Z-MC4-6000, -6100, -6200, and -6800. Its area/type table matches each group to the corresponding lighting loads.

Factory tool references include clutch center holder 07923-4280000, fork seal driver 07947-3710101, steering stem socket 07916-3710100, and bearing race remover 07953-MA00000. For CDI and regulator testing, Honda specifies the Sanwa electrical tester 07308-0020000 or the Kowa TH-5H and gives separate tables where readings differ.

Support the motorcycle securely, release front fork air pressure before disassembly, and follow Honda's precautions for brake dust, fuel, battery service, and electrical work.

Sample Jetting, Shock Spring, and Ignition Coil Specs

The carburetor table lists a #130 main jet for the XL500R's PD78A and a #125 main jet for the XL400R's PD75A. The carburetor identification number ties each jet specification to the correct unit.

For rear shock spring inspection, Honda lists a standard free length of 251.0 mm and a service limit of 248.5 mm.

The ignition coil inspection specifies 0.2–0.3 Ω for the primary winding and 3.4–4.2 kΩ for the secondary winding. The accompanying illustration shows where each resistance is measured.