Suzuki GS650 Katana Service & Repair Manual Set, 1981–1982

The GX and GZ supplements adapt the base workshop material to the shaft-drive GS650G Katana. For GZ service, the later supplement takes precedence wherever its specifications or procedures differ.

Coverage limits: General Information pages 1-1 through 1-9 and GX specification pages 10-1–10-2 are absent. Further gaps affect valve-seat service, secondary bevel-gear setup, electrical diagnosis and front-caliper inspection. The shared GZ/GD color wiring diagram does not extend the repair coverage to the 1983 model.

PDF Search, Bookmarks and Wiring Detail

Search and diagram access: PDF text search is not available. Embedded bookmarks cover the main chapters and supplements, although many individual entries use image filenames. Small wiring labels require zooming; some lines in the color diagrams are faint.

The ZIP download contains one printable English-language PDF with 356 pages. This total includes the publication material listed above, one cover page and two additional full-page color wiring diagrams.

Engine, Shaft-Drive and Katana System Coverage

The following selected topics outline the repair content rather than reproduce the complete contents list. Other subjects include battery servicing and oil-gallery plug locking plates.

• Engine and transmission: Step-by-step engine removal, disassembly and reassembly, cylinder-head servicing, cam timing, piston and crankshaft inspection, clutch, starter clutch and transmission work.

• Shaft drive: Output-shaft and secondary bevel-gear disassembly, propeller-shaft service, final-drive overhaul, bearing preload, backlash measurement, shim adjustment and tooth-contact checks.

• Fuel and tune-up: Mikuni BS32SS carburetor servicing and balancing, float adjustment, valve-shim selection, compression testing, oil-pressure checks and ignition-timing inspection.

• Chassis and brakes: Wheel-bearing replacement, steering-stem and swingarm service, fork disassembly, disc-brake work, master-cylinder inspection, brake-pad replacement and hydraulic bleeding.

• Electrical diagnosis: Charging, ignition, starter, meter, lamp and switch checks, supported by complaint/cause/remedy charts, routing layouts and market-specific wiring diagrams.

• GZ-specific systems: Coil-type fuel-gauge testing, replacement-only oil pump, anti-dive fork inspection and bleeding, revised front brake reservoir and adjustable rear-shock damping.

Suzuki addresses the supplementary material primarily to experienced mechanics, while also identifying a role for DIY mechanics and apprentices. Precision engine and final-drive work assumes suitable measuring equipment and workshop experience.

Engine Inspection and Assembly

The in-frame service chart distinguishes accessible components from jobs requiring engine removal, helping plan the extent of a repair before disassembly. Internal coverage includes valve-guide replacement and reaming, camshaft and cam-chain inspection, piston-ring fitting, bearing selection, and mainshaft and layshaft servicing.

Valve-seat leak checks remain, but printed pages 3-25–3-26 are missing from that servicing sequence. The later bearing bulletin explains the revised crankshaft lubrication arrangement and warns that a non-grooved bearing in the lower crankcase can interrupt oil distribution and damage internal engine parts.

Final-Drive Setup and Production Changes

Final gear-case procedures cover seal and bearing replacement, coupling assembly, preload measurement and the relationship between backlash and tooth contact. The coupling nut crushes a one-use spacer; the manual warns against correcting excessive preload by simply loosening the nut.

Printed pages 4-7–4-8 are absent from the secondary bevel-gear shim/preload section. Secondary backlash and tooth-contact procedures remain, together with preload specification tables.

Production bulletins distinguish revised bearings, early and late fork adjusters, and the primary-driven-gear spacer/shim combination. The appendix includes thrust-clearance inspection and adjustment for the revised clutch-drive assembly.

Carburetors, Brakes and Anti-Dive Forks

Carburetor illustrations explain diaphragm operation and the slow, main, starter and float circuits. Servicing extends to rack separation, jet and needle-valve inspection, reassembly and synchronization.

The GZ material distinguishes the fork-oil circuit from the brake-fluid circuit and covers modulator inspection, fork removal differences and the anti-dive bleeding sequence. Its modulator sections are replaced as units rather than repaired with individual internal replacement parts.

Front-caliper coverage is interrupted by missing printed pages 7-7–7-8. Rear-caliper inspection, master-cylinder work and brake-bleeding instructions remain.

Engine removal, spring-loaded driveline parts, final-drive setup, and hydraulic brake or anti-dive repair require secure support, the specified measuring tools, and proper shop safety practices.

Electrical Tests, Tools and Service Illustrations

The GZ fuel-gauge section separates meter operation and accuracy checks from sending-unit resistance tests. Side-stand warning-circuit differences are identified by market. In the base electrical chapter, printed pages 6-7–6-8 are absent between the ignition and starter material.

Illustrations include the final gear-case breather circuit, bevel-gear tooth-contact patterns, coil-type fuel-gauge circuit, anti-dive fork sectional views and wire-and-cable routing layouts.

Factory tables provide torques, fluid specifications, wear limits and electrical test data. Listed Suzuki tools include carburetor balancer gauge set 09913-13121, tappet depressor 09916-64510, clutch sleeve-hub holder 09920-53710, final-drive coupling holder 09924-64510 and steering-nut socket 09940-14911.

Examples of Valve, Oil-Pressure and Fuel-Gauge Data

For the GZ engine, the cold tappet-clearance specification is 0.03–0.08 mm for both intake and exhaust valves. Its oil-pressure table specifies pressure above 300 kPa and below 550 kPa at 3,000 r/min with oil at 60°C.

The GZ fuel-gauge sending-unit table gives approximately 3 Ω at the full float position and 110 Ω at empty, alongside separate procedures for checking the instrument.