1985–1990 Suzuki GSX250FWS Factory Service & Repair Manual (P/N 99500-32040-01E)

• Coverage is identified by model code and frame number: GS250FWS; GSX250FM ('91), GSX250FN ('92), GSX250FP ('93), and GSX250FR ('94); plus GJ72A GSX250RH/RCH, GSX-R250CJ, and GSX-R250CK. The Japanese guide maps starting frame numbers GJ72A-100001, GJ72A-111183, and GJ72A-120551 to the March 1987, January 1988, and March 1989 releases.
• Factory engine repair coverage includes removal and installation, inline-four disassembly and reassembly, valve timing and shim service, piston and ring inspection, crankshaft and connecting-rod bearing selection, clutch work, and six-speed transmission service.
• Fuel, lubrication, and cooling sections cover BSW24SS and BSW27 carburetor disassembly and synchronization, fuel-cock and fuel-pump testing, oil-pressure checks, radiator and cap inspection, thermostat and fan-switch diagnosis, and water-pump repair.
• Electrical diagnosis includes ignition and charging tests, starter-motor and relay inspection, switch and meter checks, side-stand/ignition interlock diagnosis, solenoid-control testing, wiring diagrams, and model-specific wire, cable, and hose routing.
• Chassis procedures address front and rear brake service and bleeding, wheel and tire work, fork and steering-stem overhaul, swingarm and linkage inspection, and the GS250FWS anti-dive fork, Full-Floater rear suspension, and rear drum brake configuration.
• The 532-page PDF set contains a 122-page GS250FWS service manual, 229-page GSX250F workshop manual, 152-page Japanese GJ72A service guide, 23-page English GSX-R250 owner's manual, and six pages of supplementary specifications, wiring, and workshop notes. The GS250FWS book is Suzuki P/N 99500-32040-01E.

This multi-document reference set covers several distinct quarter-liter Suzuki platforms. The two main English service manuals document different engines, carburetor systems, brakes, suspension layouts, and electrical equipment. Suzuki states that these publications were prepared primarily for experienced mechanics, while also recognizing apprentice and do-it-yourself mechanics as users. Internal repair work is best suited to readers who can use precision measuring equipment, electrical testers, and model-specific pullers, holders, installers, and gauges.

Engine, Fuel, and Cooling Work

The GS250FWS manual combines system descriptions with inspection, adjustment, and overhaul coverage for its liquid-cooled DOHC four-cylinder engine. Its BSW24SS twin-carburetor system, front-disc/rear-drum brakes, anti-dive fork, and remotely adjustable Full-Floater rear suspension make it a distinct platform. Engine chapters connect the teardown sequence to bearing selection, valve timing, lubrication, cooling, and final reassembly rather than stopping at routine tune-up work.

The GSX250F book uses the 1991 GSX250FM as its base model. Its 1992 FN supplement supplies changed specifications, service data, a dedicated wiring diagram, and revised routing views; the 1993 FP and 1994 FR sections provide changed specifications and service data only, referring back to the base chapters for repair procedures. That distinction matters when choosing a repair section for a later bike.

Diagnostics, Chassis, and Special Tools

The GSX250F chapters include symptom/cause/remedy troubleshooting for the engine, carburetion, clutch and transmission, charging system, battery, and chassis. Factory checks cover compression and oil pressure, carburetor balance, charging output, regulator/rectifier condition, ignition-coil performance, starter circuits, cooling controls, and brake operation. The ignitor section calls for Suzuki digital ignitor checker 09931-94430 with adapter 09931-94460; other named tools include carburetor balancer 09913-13121, front-fork oil-seal installer 09940-50113, and swingarm bearing remover 09923-73210.

The GS250FWS section services a front disc and rear drum, while the GSX250F material covers hydraulic front and rear calipers, master cylinders, pad replacement, and air bleeding. Fork disassembly, steering-head bearing work, wheel service, swingarm removal, cushion-lever bearing inspection, and rear-shock checks are documented with the related torque tables, wear limits, fluid data, electrical values, and adjustment specifications.

Diagrams and Supplementary Files

Assembly and diagnostic illustrations include engine disassembly/reassembly charts, transmission and valve-train exploded views, the lubrication-system diagram, the side-stand/ignition interlock circuit, base and 1992 wiring diagrams, and detailed cable, brake-hose, and spring-adjuster-hose routing views. The Japanese GJ72A service guide adds photo-led teardown coverage, tool charts, variant service data, and CJ/CK electrical schematics. Its CJ and CK addenda are marked Service Guide No. 187 and Service Guide No. 226.

The Japanese guide covers most major repair areas, but its instructions are in Japanese. The remaining extras include a Danish CK wiring diagram keyed to frame GJ72A-120551 and later, a Danish Motul service-data sheet, two Danish workshop-note files, and a one-page English 1989 GJ72A specification summary. These supplementary files are not Suzuki factory manual chapters and should not replace the model-specific procedures.

Excess crankcase sealant can obstruct a bearing or oil passage, and incorrect valve-guide installation can damage the guide or cylinder head. Fuel-system work, hot cooling-system components, and hydraulic brakes require suitable protective equipment, ventilation, fire-safe handling, and the prescribed final checks.