2003–2004 Kawasaki KFX400 ATV Service Manual (P/N 99924-1301-03)

This Kawasaki KFX400 service manual covers 2003–2005 KSF400-A1 through A3 models. P/N 99924-1301-03, Third Edition, August 20, 2004, combines the Kawasaki supplement with the Suzuki LT-Z400 base manual and its model supplements.

Text search and diagram detail: Service-chapter text is searchable, but the covers and frame-number application table are not. There are no embedded PDF bookmarks. Small wiring-diagram labels require zooming.

• Engine repair: Engine removal and installation, crankcase splitting, cylinder-head service, valve-clearance adjustment, and camshaft timing procedures.

• Clutch and transmission: Wet-clutch inspection and replacement, gearshift cam and fork service, reverse-lock checks, and starter torque-limiter testing.

• Fuel system: Mikuni carburetor disassembly, cleaning, inspection, float adjustment, and throttle-position sensor setup for the later carburetor configuration.

• Cooling and lubrication: Water-pump overhaul, radiator pressure testing, thermostat and fan-switch checks, oil-pressure testing, and oil-system service.

• Chassis and brakes: Front and rear brake repair and bleeding, steering toe-in adjustment, wheel and swingarm bearing service, and suspension settings.

• Electrical diagnosis: CDI ignition, charging and starter troubleshooting, component tests, wiring diagrams, and harness, cable, and hose-routing drawings.

Written primarily for trained mechanics in properly equipped shops, the manual also covers basic maintenance and repair for owners who understand mechanical work, tools, and workshop procedures.

Kawasaki Supplement and Model Differences

The Kawasaki supplement supplies model-specific specifications, maintenance schedules, and intake and exhaust valve shim-selection charts. Its special-tool tables cross-reference Suzuki tools to Kawasaki equivalents, including crankcase splitting tool assembly 57001-1362 and clutch holder 57001-1243.

Carburetor configurations: KSF400-A1 and A2 use the Mikuni BSR36; A3 specifications identify the BSR37. Regional carburetor data include California pilot-screw provisions.

The included LT-Z400K4 and K5 supplements document changes to chassis tightening torques, parking-brake details, clutch plate arrangements, suspension settings, and throttle-position sensor installation. These revisions help distinguish the applicable assembly and adjustment information before repair work begins.

Engine and Drivetrain Repair

The engine chapter covers the liquid-cooled DOHC single, crankshaft and connecting-rod inspection, and balancer shaft and driven gear service. The five-speed constant-mesh transmission section addresses shafts, shift forks, the shift cam, and reverse-lock assembly.

Service tables provide wear limits, clearances, fluid capacities, and cylinder-head, exhaust, and chassis torque data. The camshaft/automatic decompression assembly and starter torque limiter are inspected as units; their internal disassembly is excluded.

The crankshaft installation notes warn that hammering the shaft into the crankcase can disturb crankshaft alignment.

Carburetor, Cooling, and Oil Circuits

The carburetor construction view identifies the diaphragm, needle valve, and jet circuits. Its cleaning cautions explain how compressed air applied with the diaphragm installed can damage it.

Cooling-system references distinguish cooling-fan thermo-switch tests from coolant-warning-switch and thermostat checks. Water-pump inspection covers the impeller, bearing, mechanical seal, and oil seal.

The Engine Lubrication System Chart traces feed and return flow through the dry-sump oil tank, oil pump, filter, and crankcase passages.

Brakes, Steering, and Suspension

Brake chapters cover caliper and master-cylinder repair, parking-brake adjustment, and operational checks. Rear axle service includes the Rear Axle Nut Tightening Torque calculation for the offset axle-nut tool.

Front and rear suspension settings cover spring preload, with compression and rebound damping adjustments for the applicable units. The rear shock absorber is a replacement assembly, with no internal rebuild procedure. It contains high-pressure nitrogen; follow the manual's handling and disposal precautions.

Electrical Tests and Wiring References

Charging, starting, and ignition troubleshooting flowcharts connect symptoms with tests for the three-phase AC generator, regulator/rectifier, starter relay, ignition coil, pickup coil, and signal coil. These checks help isolate a no-spark or charging fault before replacement parts are selected.

Separate Wiring Diagrams accompany the base manual and both model supplements; the K5 diagram includes the throttle-position sensor. Wiring Harness Routing and Cable Routing drawings support electrical and chassis reassembly.

PDF Sections and Included Supplements

One printable English PDF contains 381 pages total: Kawasaki cover/front matter and supplement, 38 pages; Suzuki base manual with its divider/front matter, 306 pages; LT-Z400K4 supplement, 17 pages plus one blank separator; LT-Z400K5 supplement, 18 pages; Kawasaki back cover with the model-application table, one page. All covers, blank pages, and supplements are included in that total.