1990 Suzuki GS250FWS Motorcycle Service Manual (122 P.)
Covers GS250FWS models with procedures for engine, transmission, electrical, carburetor, brakes, suspension, and cooling systems. Complete factory service and repair specifications.
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Sample pages from the 1990 Suzuki GS250FWS Motorcycle Service Manual (122 P.) manual
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Models Covered & Key Technical Specifications
Suzuki GS250FWS — 1990 Procedural Technical Compendium | GS250FWS Series Bundle.
- Maximum Enclosure Specs: 249 cm³ is designed for the engine piston displacement Margin.
- Universal Addressable Resolution: For optimal combustion, 10.9:1 controls the compression ratio Protocol.
- Established Clamp Forces: 23—27 N·m — is measured at the conrod cap fastening Architecture.
- Measured Spacing Data: The fuel tank requires 15.0 L (16.0 L including reserve) Norms.
- Published Electrical Load: Generator rotor bolt reaches 110—130 N·m (11.0—13.0 kg·m) at peak torque Bounds.
- System Footprint Data: Front fork stroke is specified as 130 mm for suspension travel Topology.
Manual Description & Preview
Verified Installation Shop Manual: Motorcycle Suzuki GS250FWS: Factory Service & Repair Manual (1990) for Classic Motorcycle Maintenance Standards-Vault
Conceptual-Layout: Suzuki GS250FWS (1990) // Model-Designation: Four-Stroke Liquid-Cooled Engine / Transmission Systems Logic // Conceptual-Layout: 122-page factory service documentation with complete technical specifications.
| Assessment-Element | Value | Calibration-Spec |
|---|---|---|
| Document Overview | 122-page service manual | Complete factory specifications provided |
| Primary System Coverage | Engine, transmission, cooling, electrical | All major assemblies documented |
| Technical References | Wiring diagrams, component schematics | See Chapters 2-5 |
Major sections focus on engine architecture covering the liquid-cooled DOHC four-cylinder configuration, transmission assembly detailing the 6-speed constant mesh gearbox, ignition system incorporating transistorized control, and chassis suspension featuring the full-floater rear design. The document encompasses lubrication procedures documenting oil flow paths through the wet sump system, electrical component behavior including the three-phase A.C. generator and starter mechanics, cooling solution specifications with radiator and thermostat operation, and brake system architecture for both front disc and rear drum configurations.
Fuel system procedures are documented for the MIKUNI BSW24SS carburetor and fuel delivery mechanism including the diaphragm-type fuel cock. Adjustment procedures are detailed for valve clearance inspection, ignition timing verification, and carburetor synchronization using vacuum testing methodology. Timing procedures are documented for camshaft positioning relative to crankshaft alignment with precision pin-counting on the cam drive chain. Technical notes are provided for inspection criteria covering compression pressure limits, oil pressure thresholds, spark plug gap verification, and battery voltage regulation at operating RPM. Quality checks are addressed for periodic maintenance intervals including spark plug replacement scheduling, engine oil change frequency, coolant renewal requirements, and drive chain slack inspection at specified distances.
The manual documents torque specifications for the conrod cap assembly and crankcase bolts to ensure proper fastener tension and bearing load distribution.
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