1990 Suzuki GS250FWS Service & Repair Manual (P/N 89500-32040-01E)

• Official Suzuki Motor Corporation publication (P/N 89500-32040-01E, 1990 edition)
• 122-page primary factory reference for the GS250FWS liquid-cooled series
• Contains over 150 technical illustrations, exploded-view diagrams, and service specification tables
• Documents the anti-dive front fork, MIKUNI BSW24SS carburetors, and transistorized ignition system setup
• Provides critical clearance values and torque settings for engine and chassis maintenance
• Covers the blow-by gas recycling system, water pump assembly, wax-pellet thermostat, oil pressure regulator, cam chain tensioner, regulator/rectifier, and signal generator
• Features wiring diagrams, periodic inspection charts, lubrication charts, tappet shim size charts, bearing selection tables, and ignition system schematics

Document Structure and Technical Depth

The 1990 Suzuki GS250FWS manual breaks down complex factory data into five core sections within this comprehensive PDF. You get general machine information, component descriptions, inspection protocols, teardown sequences, and servicing data for accurate troubleshooting. It starts with standard machine identification. From there, the text moves into fluid recommendations—like specific cooling solution ratios—and proper engine break-in procedures. Mechanics will find the breakdown of the liquid-cooled four-cylinder DOHC configuration highly detailed. The manual also maps out the 6-speed transmission and electronic systems, including the generator and starter. Readers gain a complete look at the engine, electrical network, carburetor, brakes, and full-floater suspension.

For the daily workshop routine, the specific advantage lies in the direct access to factory-approved testing sequences and component tolerance limits. This allows technicians to verify engine wear through precise plastigauge clearance readings and immediate torque value cross-referencing, preventing catastrophic assembly mistakes like over-torquing the aluminum crankcase. To save on expensive trips to the dealership, the text provides step-by-step repair walkthroughs for labor-intensive tasks, such as multi-cylinder carburetor balancing using a vacuum tester, routine valve clearance adjustments using the tappet shim method, and complete front fork disassembly.

Engine and Chassis Specifications

Precision matters in the workshop. This publication outlines specific inspection parameters for every major component to help verify part wear. For example, engine assembly data dictates a cold intake valve clearance of 0.10 to 0.20 mm. The tolerance chart lists the main crankshaft journal oil clearance at 0.020 to 0.044 mm. Cooling system capacity is documented at exactly 1.9 liters, including the reserve tank. You also get extensive exploded diagrams covering the BSW24SS carburetor assembly and the starter clutch mechanism. Critical fasteners are clearly marked with their required torque values, such as the generator rotor bolt at 110 to 130 Nm. Because working on high-performance motorcycle systems carries inherent physical risks, factory specifications should always be applied with proper mechanical training, and consulting a certified technician is recommended before tackling complex diagnostic work.