Suzuki GSX250F Service Manual Set (1991–1998)

The GSX250FM base manual contains the repair procedures. The four supplements provide model-specific specifications and service data to use alongside it. The GSX250FN supplement also includes its own wiring diagram and routing views, including the speedometer cable and front brake hose.

PDF Navigation and Wiring Detail

Finding information: PDF text search is unavailable. Two bookmarks open the carburetor illustration and specification table. The full wiring diagrams need zooming, and some small connector labels and wire codes remain hard to read. Printed chassis pages 7-2 through 7-4 appear out of order in the PDF.

The ZIP download contains one printable English-language PDF with 242 pages. The total includes the foreword and group index in the base manual and all 42 pages of model supplements.

Engine Overhaul, Carburetor Balancing, and Chassis Service

This selection of workshop topics also includes examples such as speedometer gearbox inspection and oil sump strainer service.

• Maintenance and tune-up: Factory service schedule, lubrication points, valve clearance checks and shim selection, battery inspection, and drive-chain and brake service.
• Engine and transmission: Compression and oil-pressure tests, in-frame service access, engine removal, cylinder-head work, and crankshaft, clutch, and gearshift inspection.
• Fuel delivery: Rear fuel tank removal, fuel cock, pump and relay testing, carburetor overhaul, float setup, and running vacuum synchronization.
• Cooling and electrical: Radiator, thermostat, and water pump service, plus ignition, charging, starter, and side-stand interlock diagnosis.
• Chassis: Fairing and wheel removal, brake caliper and master cylinder overhaul, front fork rebuilding, steering-stem bearings, and rear swingarm and link suspension service.
• Workshop references: Troubleshooting tables, engine and chassis torque charts, bolt-grade torque guidance, service limits, wiring diagrams, and cable and hose routing views.

Suzuki wrote the manual primarily for experienced mechanics and also identifies it as a repair reference for apprentices and DIY mechanics.

Engine Rebuild and Gear Selection

The engine chapter identifies which parts can be serviced with the engine in the frame. It covers cylinder, piston, and ring inspection, color-coded connecting-rod and crankshaft bearing selection, Plastigage clearance checks, thrust-bearing selection, and cam timing. The wet multi-plate clutch has its own inspection and reassembly procedures. Suzuki specifies assembly replacement for the oil pump.

A transmission cross-section shows where the gears, washers, and circlips fit during reassembly. The supplements list revised fifth- and sixth-gear ratios, so the model code matters when comparing gears with the factory data. The cylinder-head chapter also warns that uneven camshaft journal holder tightening can damage the head or holder thrust surfaces, and that fitting a replacement valve guide into a dry bore can damage the guide or head.

Rear Fuel Tank and Cooling Tests

The tank removal section shows which bodywork and rear chassis parts affect access, along with the fuel-level sender and lid solenoid connections. For the Mikuni BSW27 carburetors, the manual covers jet and needle-valve inspection, diaphragm installation, preliminary throttle-valve alignment, and final synchronization with Suzuki balancer 09913-13121.

Cooling procedures cover radiator pressure testing, the reservoir, coolant mixture, water pump service, and bench tests for the thermostat, water temperature gauge, and fan switch. Use a ventilated shop for gasoline handling and running-engine tests, and follow Suzuki’s precautions for hot coolant, battery isolation, and brake hydraulics.

Electrical Diagnosis and Chassis References

The fully transistorized ignition section covers the signal generator, coils, and ignitor, including Suzuki digital ignitor checker 09931-94430 and adapter 09931-94460. The starter and side-stand interlock diagrams help trace a no-crank fault through the starter relay and safety switches. The chapter also covers stator and regulator/rectifier tests, starter-motor overhaul, front and rear solenoids and their control unit, instruments, lamps, switches, and battery charging.

Chassis references include brake disc inspection, tire and wheel bearing service, ignition-switch removal, and torque specifications for the steering stem and swingarm. The tool index lists steering-stem nut wrench 09940-49110 and front fork oil-seal installer 09940-50113.

A Sample of Clearance and Electrical Checks

For GSX250FM valve service, Suzuki specifies cold clearances of 0.17–0.27 mm at the intake and 0.20–0.30 mm at the exhaust. The shift fork inspection gives a standard fork-to-groove clearance of 0.1–0.3 mm and a service limit of 0.5 mm.

The tune-up section gives a spark plug gap of 0.6–0.7 mm. The starter circuit section specifies 2–6 ohms for the starter relay coil, a separate check from the side-stand interlock tests.