1990 Suzuki GS250FWS Motorcycle Service Manual (122 P.)

Technical Scope for the 1990 Suzuki GS250FWS

• Covers 1990 Suzuki GS250FWS motorcycles, featuring the liquid-cooled DOHC four-stroke engine and full-floater suspension system
• Official Suzuki Motor Corporation publication P/N 89500-32040-01E, 1990 edition
• Contains over 150 technical illustrations, exploded-view diagrams, electrical schematics, and comprehensive service specification tables
• File delivered as a direct download the moment payment clears
• Laid out for standard letter and A4 printing
• Full-text search finds any part number in seconds
• Detailed coverage documents the anti-dive front fork, MIKUNI BSW24SS carburetors, and transistorized ignition system setup
• This 1990 service publication is the primary factory reference for the GS250FWS liquid-cooled series, providing critical clearance values and torque settings for engine and chassis maintenance

Document Structure and Technical Depth

The 1990 Suzuki GS250FWS service manual organizes technical information into five primary sections: general information, component descriptions, inspection and adjustment, engine/chassis disassembly, and servicing data. The text begins with a detailed general information chapter covering machine identification, fluid recommendations including cooling solution ratios, and engine break-in procedures. The subsequent sections detail the liquid-cooled four-cylinder DOHC configuration, the 6-speed transmission, and the electronic systems including the generator and starter.

Engine and Chassis Specifications

Detailed inspection parameters are documented for every major component. Intake valve clearance is specified at 0.10–0.20 mm when cold in the engine assembly data. The coolant system capacity for the 1990 Suzuki GS250FWS is documented at 1.9 liters, including reserve. Main crankshaft journal oil clearance is listed at 0.020–0.044 mm in the tolerance chart. The manual also provides extensive exploded diagrams for the BSW24SS carburetor assembly, starter clutch mechanism, and the full-floater rear suspension system, along with torque values for critical fasteners like the generator rotor bolt at 110–130 Nm. Reference only — always consult a certified technician before performing service on this equipment. An official 122-page Suzuki OEM motorcycle manual covering the 1990 GS250FWS, documenting engine, chassis, electrical, and cooling system specifications for the liquid-cooled four-cylinder machine.