1987–1998 Suzuki LT-F250, LT-4WD & LT-F4WDX ATV Repair Manual

This Clymer service and repair manual covers the 1987–1998 Suzuki LT-F250 and LT-4WD Quad Runner models and the LT-F4WDX King Quad, with maintenance, troubleshooting and repair procedures for their engine, drivetrain and chassis systems.

• Engine repair: Engine removal, cylinder-head and camshaft service, piston inspection, crankcase separation, crankshaft checks and wet-sump lubrication components.

• Clutch and transmission: Centrifugal and manual clutch service, main transmission disassembly, shift-mechanism inspection and separate illustrations for the 2WD and 4WD sub-transmissions.

• Fuel and exhaust: Carburetor removal, disassembly, cleaning and adjustment, plus fuel-pump, shutoff-valve, throttle-cable and exhaust-system service.

• Electrical diagnosis: Charging, CDI ignition and electric-start troubleshooting, component test charts, connector identification and model-specific wiring diagrams.

• Suspension and driveline: Steering-knuckle and wishbone service, wheel bearings, rear suspension, drive axles, propeller shaft and front-differential removal and inspection.

• Drum brakes: Front hydraulic brake service, master-cylinder inspection and bleeding, plus rear brake shoes, cables, pedal linkage and adjustment.

Written for DIY owners and professional mechanics, the manual explains basic tools and workshop methods while identifying jobs that require specialist equipment or dealer service.

Engine Overhaul, Clutches and Shift Mechanisms

The engine chapters detail cylinder-head, valve, camshaft, cylinder and piston inspection, with separate specifications for the two engine sizes. A cylinder leak-down tester diagram supports the diagnostic material, while component tables distinguish standard dimensions from wear limits.

Lower-end coverage includes the crankshaft, recoil starter, starter clutch, oil strainer and LT-F4WDX oil cooler. The oil pump is covered as a replacement assembly; internal pump repair is not provided.

The clutch section explains the centrifugal clutch, wet multi-plate manual clutch and lifting mechanism. It flags the left-hand-threaded centrifugal primary-drive nut, a detail that helps prevent thread damage from treating it as a conventional fastener.

The transmission chapter covers the shared five-speed main transmission and identifies differences in the sub-transmission gear assemblies. For disassembly of the 4WD sub-transmission output-shaft assembly and its shim-dependent bevel-gear setup, the manual directs the work to a Suzuki dealer.

Carburetor Variants and Fuel-System Service

Carburetor procedures are divided into 1987–1989 and 1990-on sections, with exploded views and cleaning, float-level and adjustment information. Specification tables distinguish Mikuni VM24SS and BST31SS applications, including Canadian-market differences.

These model-specific tables help identify the applicable carburetor configuration before selecting parts or adjustment data. Related sections cover fuel-system contamination, the fuel pump, choke and throttle cables, air-filter housing and exhaust components.

Charging, CDI and Starting-System Diagnosis

Electrical coverage combines charging-system and ignition schematics with voltage-regulator and CDI test-point charts. Wiring diagrams distinguish model and market versions, including U.S./U.K./Canadian, Australian and Swedish applications.

The troubleshooting sections connect weak-spark, no-spark, battery-charging and starter symptoms with component and wiring checks. This provides a way to narrow down a fault before replacing an electrical assembly.

CDI resistance testing specifies the Suzuki Pocket Tester, part No. 09900-25002. The manual explains that readings from a different meter can lead to an incorrect diagnosis.

Steering, Drive Axles and Drum Brakes

Chassis procedures include steering-shaft and tie-rod service, wishbone bushings, steering-knuckle bearings and rear suspension components. Exploded views of the front wishbone and steering-knuckle assembly show the relationship between the mounting hardware and service parts.

Front-axle coverage distinguishes the early universal-joint design from later CV joints. The later inboard CV joint can be serviced; the outboard joint is nonserviceable. Propeller-shaft inspection and front-differential removal are covered, but internal differential repair is referred to a Suzuki dealer.

Brake coverage separates the hydraulic front drums from the cable-operated rear drum. Master-cylinder inspection, brake-line replacement and bleeding procedures accompany shoe, drum and linkage checks. The brake chapter also warns that contamination can damage hydraulic components.

Ensure the ATV is securely supported before suspension or brake work.

Examples of Head-Nut Torque and Refill Data

For LT-F250 and LT-4WD engines, the torque tables list 18–23 N·m for the 8 mm cylinder-head nuts, alongside separate entries for the other head and cylinder fasteners.

Refill tables distinguish an oil-and-filter change at 3,600 ml from other engine filling conditions. The 4WD front differential has its own 150 ml refill specification.

Searchable Text, Chapter Bookmarks and PDF Contents

Search and diagram detail: An embedded OCR text layer supports text search, although recognition errors can affect exact terms and table entries. Bookmarks cover the chapters, index and wiring diagrams. Small labels in dense wiring diagrams require zooming.

One printable English PDF contains 472 pages, including eight preliminary pages: the title page, chapter guide, three contents pages, two quick-reference pages and introduction. The remaining 464 pages contain the numbered manual sections, index and wiring diagrams.