1977-1983 Suzuki GS400, GS450 Twins Service Manual

Technical reference for GS400 and GS450 Twins models, covering 1977-1983. Documents engine, chassis, and electrical system repairs. PN 0-89287-237-3.

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Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

Suzuki Models Covered & Key Technical Specifications

Models: Suzuki GS400, Suzuki GS425, Suzuki GS450
Sub-models / Variants: GS400, GS425N, GS425EN, GS425LN, GS450E, GS450ST, GS450LT, GS450LZ, GS450TZ, GS450TXZ, GS450ED, GS450LD, GS450TXD
Build Years: 1977–1983
Technical Data:

  • Engine type: Air-cooled, 2-cylinder, 4-cycle, dual overhead camshaft (DOHC)
  • Fuel octane requirement: 90 octane or higher
  • Ignition timing (GS400/GS425): 10° BTDC at 1,500 rpm; 40° BTDC at 3,600 rpm
  • Valve clearance: 0.03–0.08 mm (0.0012–0.0031 in.)
  • Spark plug type: NGK B8ES or ND W24ES
  • Fork oil capacity (GS450LZ): 189 cc (6.4 U.S. oz.)
  • Standard compression pressure: 130–184 psi (GS400/GS425); 130–170 psi (GS450)
  • Front axle nut torque: 3.6–5.2 mkg (26–38 ft-lb.)
  • Handlebar clamp bolt torque: 1.2–2.0 mkg (9–14 ft-lb.)
Technical Specifications
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Document Number / Seller:
29779 / Margaret Bell
File Size:
194.68 MB
File Type:
ZIP
Language:
English
Printable:
Yes
Category:
Bike
Last updated / verified
Oct 9, 2025

Suzuki Manual Features & Content Preview

1977–1983 Suzuki GS400/GS450 Service Manual

  • Covers 1977–1983 Suzuki GS400, GS425, and GS450 twin-cylinder motorcycles, including all variants and displacement configurations.
  • Official Clymer publication, third edition dated May 1985, ISBN 0-89287-237-3.
  • Contains 111 captioned service diagrams, 8 detailed technical specification tables, and comprehensive exploded-view assembly guides for engine and chassis components.
  • Accessible from your device as soon as the order is placed.
  • OCR text layer lets you jump to a torque spec by keyword.
  • This 1985 third edition includes critical model-year updates for 1982–1983 service information not present in early GS-series publications.

Technical Documentation Scope

The 1977–1983 Suzuki GS400 and GS450 service manual provides a structured repository for owner-performed maintenance and technical reference. This publication outlines the organization of engine, fuel, electrical, and suspension systems, utilizing clear imagery and tables to assist in component identification. The first section establishes the fundamental guidelines for shop organization and tool selection, followed by specialized chapters detailing the disassembly, inspection, and assembly of cylinder heads, valve trains, and crankcase assemblies. Owners can utilize the indexed reference guide to navigate between periodic maintenance schedules and complex mechanical overhauls.

Specification and Data Preview

The 1977–1983 Suzuki GS400 manual includes detailed tables for torque requirements, fluid capacities, and electrical ignition settings. Cylinder head bolt torque is specified at 26–29 ft-lb. in the engine assembly documentation. The valve clearance for the intake is listed at 0.03–0.08 mm in the cylinder head specification table. Fork oil level for the GS450LZ is documented at 117 mm. Detailed tables for tappet shim sizes and compression pressure limits allow for precision engine tuning across all twin-cylinder variants. This volume functions as a reference-grade Clymer workshop manual for the 1977–1983 Suzuki GS400 and GS450 twin-cylinder series, providing essential engine, chassis, and electrical specifications for the entire model run.

Manual FAQ, Purchase & Download Details

Which specific mechanical systems receive the deepest coverage in this Suzuki service manual? keyboard_arrow_down

Manual provides comprehensive sections detailing the engine, clutch, transmission, and electrical systems, along with dedicated chapters for suspension, braking, and fuel components.

Are reference tables, such as the Quick Reference Data, included to show technical specifications like ignition timing and spark plug gaps? keyboard_arrow_down

Document includes Quick Reference Data tables that list tune-up specifications, recommended spark plug types, and valve clearance tolerances. These tables are designed to provide rapid access to baseline technical data for the covered models.

Is there a structured breakdown of chapters covering the engine, transmission, and electrical components for these motorcycle models? keyboard_arrow_down

Manual is organized into eleven main chapters that systematically cover engine components, clutch and transmission assemblies, and the complete electrical system. A supplement is also included to provide additional service information for 1982 and later models. Each chapter lists relevant system details and internal component references for the GS400 and GS450 twin series.

What is the official edition and publication history for this Suzuki GS400 and GS450 twins manual? keyboard_arrow_down

Document is the third edition published by Clymer Publications, which includes updates by David Sales for 1982-1983 models.

Does the manual include exploded views or diagrams for component identification? keyboard_arrow_down

Manual contains numerous photos, drawings, and tables throughout the chapters to illustrate component assemblies and system layouts. These illustrations are included to support the identification of parts and general system overview.

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