Need help?Do you have a question about the Kawasaki KX125 1990 and is the answer not in the manual?
Guide on navigating the service manual structure and finding information efficiently.
Essential checks and precautions before starting motorcycle maintenance or repair work.
Visual guides for identifying specific KX125 and KX250 motorcycle models.
Detailed technical specifications for KX125 and KX250 models, including dimensions and engine details.
Chart outlining required maintenance intervals for optimal motorcycle performance and longevity.
Table of tightening torques and recommended locking agents for various fasteners.
Diagrams illustrating the correct routing of throttle, brake, and clutch cables for KX125 and KX250.
Illustrated breakdown of fuel system components for KX125 and KX250 carburetors.
Standard and service limit specifications for carburetor jets, air screw, and air cleaner for KX125/KX250.
Required specialized tools for fuel system maintenance, including gauges and lubricators.
Procedures for checking, adjusting, and lubricating throttle grip free play and cable tension.
Steps for inspecting, adjusting idle speed, and checking fuel level in the carburetor.
Instructions for removing, installing, cleaning, and inspecting the air cleaner element and housing.
Procedures for removing and installing the fuel tank, including draining and checking rubber dampers.
Steps for inspecting and cleaning the fuel tap filter screen and checking for leaks.
Procedures for removing, inspecting, and installing the reed valve for proper engine performance.
Illustrated breakdown of cooling system components for KX125 and KX250.
Details on coolant type, mixture ratio, total amount, and radiator cap relief pressure.
Identification of the bearing driver set required for cooling system servicing.
Procedures for checking coolant level, inspecting for deterioration, and changing coolant.
Important safety and procedural notes before disassembling cooling system parts.
Instructions for removing, installing, and inspecting the water pump cover and impeller.
Procedure for removing oil seals from the water pump shaft area.
Correct method for installing oil seals and bearings using special tools.
Steps for removing, installing, and inspecting the radiator core and fins.
How to check the radiator core for airflow obstructions and fin damage.
Procedure for inspecting radiator cap valves and testing relief pressure using a pressure tester.
Checking the filler neck for damage and ensuring sealing surfaces are clean for proper cap function.
Visually inspecting cooling hoses for signs of deterioration like hardness or swelling.
Illustrated breakdown of top end components for KX125 and KX250 engines.
Technical data for cylinder compression, head warp, piston, and rings for KX125/KX250.
Required tools for engine top end measurements and disassembly, like compression gauges.
Procedures for measuring compression, removing, and installing the cylinder head.
Instructions for removing, installing, and inspecting the KIPS exhaust valve system.
Steps for removing and installing the cylinder and piston, including wear inspection.
Procedures for removing and installing the expansion chamber and changing silencer packing.
Illustrated breakdown of the engine's right side components for KX125.
Details on clutch lever play, spring length, plate thickness, and clearances for KX125/KX250.
Tools for clutch and shaft seal service, including pliers and holders.
Steps for removing and installing the right engine cover, noting critical alignment procedures.
Procedures for adjusting clutch lever play and ensuring proper clutch engagement and disengagement.
Detailed steps for removing the clutch cover, magneto cover, and clutch components.
Instructions for removing, inspecting, and installing the external shift mechanism components.
Procedures for removing and installing the primary gear and related components.
Steps for removing and installing the kick starter assembly, including idle gear.
Illustrated breakdown of frame and swing arm components related to engine removal.
Step-by-step guide for safely removing the engine from the motorcycle frame.
Important considerations and torque specifications for reinstalling the engine into the frame.
Illustrated breakdown of engine bottom end and transmission parts for KX125.
Details on transmission oil, gear backlash, shift fork dimensions, and groove widths.
List of specialized tools required for crankshaft and transmission servicing.
Procedures for checking transmission oil level and performing an oil change.
Step-by-step guide for splitting the crankcase halves using special tools.
Instructions for crankshaft removal, installation, and inspection for runout and alignment.
Procedures for transmission shaft removal/installation and gear inspection.
Illustrated breakdown of wheel and tire components, including torque values.
Details on rim/axle runout, tire sizes, and air pressure for KX125/KX250.
List of tools for wheel and tire service, including bearing drivers and jacks.
Procedures for removing and installing front and rear wheels, including brake checks.
Steps for removing and installing tires, including bead breaking and balance marks.
Procedures for inspecting, lubricating, and replacing hub bearings and grease seals.
Illustrated breakdown of final drive components, including sprockets and drive chain.
Details on drive chain type, length, slack, and sprocket dimensions.
Identification of the bearing driver set for final drive servicing.
Procedures for inspecting, adjusting slack, lubricating, and measuring drive chain wear.
Instructions for removing, installing, and inspecting engine and rear sprockets for wear.
Illustrated breakdown of the front disc brake system.
Details on brake adjustment, pad thickness, disc thickness, runout, and fluid requirements.
Identification of circlip pliers used in brake system service.
General safety precautions for disc brakes and procedures for adjusting lever/pedal play.
Steps for removing, installing, disassembling, and assembling brake calipers.
Procedures for removing, installing, and inspecting brake pads for wear.
Instructions for removing, installing, and disassembling front and rear master cylinders.
Procedures for inspecting brake discs for thickness, runout, and damage.
Details on recommended brake fluid, level checks, and fluid change procedures.
Instructions for removing, installing, and inspecting brake hoses for leaks or damage.
Illustrated breakdown of front fork components with torque specifications.
Details on air pressure, damping adjustments, oil levels, and spring lengths for front forks.
List of specialized tools for front fork and rear shock absorber maintenance.
Procedures for adjusting air pressure, damping, oil levels, and fork tube disassembly.
Information on rear shock absorber adjustment, spring preload, and disassembly.
Procedures for adjusting rebound damping and spring preload on the rear shock absorber.
How to adjust rebound and compression damping on the rear shock absorber.
Adjusting spring preload using the adjusting nut for optimal suspension performance.
Steps for removing and installing the swing arm, including pivot shaft and tie-rod nuts.
Procedures for removing and installing tie-rods and rocker arms, including lubrication.
Illustrated breakdown of steering components with torque values for KX125/KX250.
List of specialized tools for steering stem and head pipe race service.
Procedures for inspecting steering for looseness or binding and adjusting stem locknut.
Steps for removing and installing the steering stem, including bearings and races.
Detailed steps for removing the steering stem, head nut, and bearings.
Important notes for installing the steering stem, including lubrication and torque.
Procedure for removing head pipe outer races using specialized tools.
Instructions for installing head pipe outer races using press shafts and drivers.
Lubrication, inspection for wear, and checking steering stem for warp.
Schematic showing connections between spark plug, ignition coil, CDI unit, and magneto.
Illustrated breakdown of electrical components with torque values for KX125/KX250.
Details on ignition timing, coil resistance, spark plug gap, and CDI unit for KX125/KX250.
List of specialized tools for electrical system testing, including testers and wrenches.
Important safety rules and precautions when servicing electrical components.
How to inspect wiring for damage, check connectors for corrosion, and test continuity.
Procedure for adjusting ignition timing by shifting the stator position for optimal performance.
Steps for removing and installing the flywheel magneto, including puller usage.
Procedures for testing ignition coil arcing distance and winding resistance.
How to clean, inspect, and check the gap of the spark plug.
Guide to diagnosing and resolving common engine, fuel, ignition, and chassis problems.
Recommended lubricants for various motorcycle pivots, bearings, and cables.
Table for converting units of length, torque, pressure, speed, and power.
Overview of specific information for 1991 KX125-H2 and KX250-H2 models.
Visual identification of KX125-H2 and KX250-H2 models with left and right side views.
Detailed specifications for the 1991 KX125-H2, including dimensions, engine, and drive train.
Table of tightening torques for fasteners specific to 1991 models.
Diagrams showing cable routing for 1991 KX125 and KX250 models.
Specifications for carburetor settings and reed valve warp for 1991 KX125/KX250.
Illustrated breakdown of cooling system parts for 1991 KX125 and KX250.
Illustrated breakdown of top end components for the 1991 KX125.
Illustrated breakdown of the engine right side for the 1991 KX125.
Illustrated breakdown of frame components for engine removal/installation on 1991 models.
Illustrated breakdown of engine bottom end and transmission parts for 1991 KX125.
Tire and wheel specifications for 1991 KX125/KX250, including rim runout and tire sizes.
Illustrated breakdown of final drive components for 1991 KX125 and KX250.
Illustrated breakdown of front and rear disc brake systems for 1991 models.
Illustrated breakdown of front fork components for 1991 KX125/KX250.
Wiring diagram for the 1991 KX125 and KX250 electrical systems.
General| Engine Type | 2-stroke single |
|---|---|
| Displacement | 124 cc |
| Cooling System | Liquid-cooled |
| Bore x Stroke | 54.0 x 54.5 mm |
| Compression Ratio | 8.6:1 |
| Ignition | CDI |
| Transmission | 6-speed |
| Final Drive | Chain |
| Front Suspension | Telescopic fork |
| Front Brake | Single disc |
| Rear Brake | Single disc |
| Induction | Mikuni carburetor |
| Rear Suspension | Uni-Trak |
| Dry Weight | 194 lbs (88 kg) |
| Fuel Capacity | 8 liters |
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