Kawasaki KMX125 Service Manual 1986–1990 (P/N 99924-1072-02)

Kawasaki KMX125 factory service manual, P/N 99924-1072-02, second edition dated July 9, 1988. Its 16 chapters cover the A1/B1, A2/B2, and A3/B3 variants, with model-specific specifications and assembly details.

PDF Search, Diagram Detail, and Page Count

Search and navigation: PDF text search and embedded bookmarks are unavailable. Small labels in the main wiring diagram require zooming. Printed pages 11-14, 12-1, and 16-6 are missing, including the dedicated brake-hose section and part of the troubleshooting guide.

One printable 200-page PDF, including both covers and five front-matter pages.

KIPS, Engine Repair, and Chassis Service

These selected coverage highlights outline the main workshop sections. Other topics include air-cleaner servicing and headlight adjustment.

• Engine top end: Compression testing, cylinder-head and piston inspection, piston-ring checks, and KIPS exhaust-valve removal, installation, and operation checks.

• Crankshaft and transmission: Step-by-step procedures for engine removal, crankcase splitting and assembly, transmission-shaft service, clutch work, and shift-mechanism inspection.

• Fuel and oil injection: Carburetor disassembly, fuel-level adjustment, reed-valve inspection, and oil-pump synchronization, bleeding, and output testing.

• Liquid cooling: Leak diagnosis, pressure testing, radiator-cap and thermostat checks, and water-pump shaft and seal replacement.

• Brakes and chassis: Caliper and master-cylinder repair, brake bleeding, wheel alignment, chain and sprocket inspection, fork rebuilding, Uni-Trak linkage service, and steering-bearing replacement.

• Electrical troubleshooting: Wiring diagrams and component tests for the charging system, CDI ignition, pickup and exciter coils, switches, gauges, and oil-level warning system.

Written primarily for trained mechanics in an equipped shop, with basic maintenance and repair information for owners who understand mechanical work, tools, and workshop procedures.

Top-End and Internal Engine Work

The KIPS section addresses carbon buildup, operating-rod inspection, left/right valve identification, and exhaust-valve timing alignment. Its Exhaust Valve Position drawing shows the relationship between the valve pinions and operating rod.

Cylinder inspection includes an important repair limit: the Electrofusion cylinder cannot be bored or honed. Exploded views and component cross-sections accompany the inspection procedures, with torque, lubrication, and locking-agent notes.

Crankshaft work includes connecting-rod clearance checks, runout measurement, and flywheel alignment. Crankshaft disassembly and reassembly require a suitably equipped shop; the assembly instructions identify Crankshaft Jig 57001-1174 for protecting flywheel alignment.

Clutch reassembly covers primary-gear and balancer-gear alignment, with separate instructions for the kick starter and external shift mechanism. Cable, wire, and hose routing drawings support reinstallation after engine or steering work.

Carburetor and Oil-Injection Service

Mikuni VM26SS inspection covers float-valve needle and seat wear as well as fuel-level checks. The linked throttle, carburetor, and Superlube pump cables receive coordinated adjustment instructions.

The lubrication chapter includes check-valve testing and pump replacement. Internal oil-pump faults call for replacement of the pump assembly rather than individual internal parts.

Water-Pump Repair and Cooling Diagnosis

The coolant-flow drawing supports the cooling-system explanation, while the service sections cover seal installation, leak checks, and air bleeding.

A blocked water-pump drainage passage can force coolant past the oil seal into the transmission oil. The shaft threads can also damage the impeller O-ring during removal.

Let the engine cool before opening the pressurized cooling system, and support the motorcycle securely for engine or chassis work.

Suspension and Steering Details

Rear-shock instructions distinguish spring-preload settings and the rebound-damping adjustment fitted to A3/B3 models. The swing arm, tie rods, and rocker arm have separate removal, installation, and lubrication instructions.

Steering coverage extends beyond adjustment to stem removal and bearing replacement. Fork procedures include guide-bush and seal installation.

Electrical Tests and Fault Tracing

The Charging System Wiring Diagram and Ignition System Wiring Diagram accompany connector-terminal views and resistance tables. Separate diagrams cover the water-temperature gauge and engine oil-level warning circuit.

Magneto-output and regulator/rectifier tests help distinguish charging faults before components are replaced. South African connector and test differences are identified, and the CDI resistance test specifies Kawasaki Hand Tester 57001-983.

The symptom-based troubleshooting guide links starting difficulties, power loss, overheating, and handling complaints with possible causes.

Engine Checks and Drivetrain Data: A Preview

Top-end checks: The usable cylinder-compression range is 795–1,230 kPa with the engine warm and throttle fully open. For a replacement cylinder, standard piston-to-cylinder clearance is 0.050–0.060 mm. The reed-warp service limit is 0.2 mm.

Oil and coolant quantities: Transmission oil capacity is 0.75 L. Total coolant volume is 1.1 L with the reservoir at its FULL level.

Drivetrain settings: Primary gear nut torque is 59 N·m (43 ft-lb). Standard chain slack is 40–50 mm, measured at the tightest point with the motorcycle on its side stand.