1990 Kawasaki KDX 125SR Motorcycle Service Manual

Your 1990 KDX 125SR troubleshooting and repair guide. Covers engine, fuel system, cooling, lubrication, transmission, and wheels/tires. 50071-1223

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Kawasaki Models Covered & Key Technical Specifications

Models: Kawasaki KDX 125SR Sub-models / Variants: KDX125-A1, KDX125-B1, U.K. Model, French Model, Greek Model, Italian Model, Norwegian Model, Swiss Model, South African Model, Swedish Model, West German Model Build Years: 1990 Technical Data:

  • Engine type: 2-stroke, single cylinder, crankcase reed valve
  • Engine displacement: 124 mL
  • Cooling system: Liquid-cooled
  • Bore and stroke: 56.0 x 50.6 mm
  • Compression ratio: 8.0:1
  • Transmission: 6-speed, constant mesh, return shift
  • Primary reduction system: Gear
  • Clutch type: Wet, multi disc
  • Fuel tank capacity: 9.0 L
  • Spark plug: NGK BR8ES
  • Battery: 12 V 3 Ah
Technical Specifications
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Document Number / Seller:
26253 / Kenneth Collins
File Size:
47.80 MB
File Type:
ZIP
Language:
English
Printable:
Yes
Category:
Bike
Last updated / verified
Apr 7, 2025

Kawasaki Manual Features & Content Preview

1990 Kawasaki KDX 125SR Technical Reference

  • Covers 1990 Kawasaki KDX 125SR motorcycles including A1 and B1 variants across international market specifications
  • Original OEM publication, first edition dated April 30, 1990
  • Contains 47 exploded-view diagrams, 12 torque specification tables, and 2 complete electrical routing schematics
  • Delivered as a direct download the moment payment clears
  • Permanent availability in your purchase account — no re-buy required
  • OCR text layer lets you jump to a torque spec by keyword
  • Laid out for standard letter and A4 printing
  • This first edition is the primary reference for the 124 mL liquid-cooled KDX 125SR production launch build

Documentation Scope and Organization

The 1990 Kawasaki KDX 125SR service manual provides comprehensive technical guidance for the complete maintenance and overhaul of the 124 mL engine and chassis. It segments the motorcycle into core system chapters, detailing the fuel delivery, liquid-cooled cooling system, engine top-end, bottom-end transmission, and final drive components. Chapters also document the steering, suspension, frame geometry, and electrical equipment, with each section featuring what an OEM service publication covers to facilitate accurate diagnostic and reassembly work.

Specification Highlights

Technical data within the publication includes specific reference values for engine assembly and cycle maintenance. Cylinder head bolt torque is specified at 25 N-m in the engine data section. The coolant system capacity for the KDX 125SR is documented at 1.1 L. Primary gear nut torque is explicitly set at 59 N-m as documented in the transmission data table.

Reference only — always consult a certified technician before performing service on this equipment.

An official 1990 Kawasaki Heavy Industries motorcycle service manual for the KDX 125SR, documenting engine, drivetrain, cooling, and electrical specifications for the A1 and B1 variant production series.

Manual FAQ, Purchase & Download Details

Are component breakdown diagrams and exploded views of the fuel system included in the service manual? keyboard_arrow_down

Document contains detailed exploded views that illustrate the arrangement of parts for the carburetor assembly, fuel tank, and air cleaner housing.

Does the manual cover the engine top end, clutch, transmission, and final drive systems? keyboard_arrow_down

Service manual includes comprehensive chapters dedicated to the engine top end, engine bottom end, transmission, final drive, and lubrication systems. These sections contain technical data and general information relevant to those specific vehicle components.

Can I reference cable, wire, and hose routing diagrams to verify layout configurations? keyboard_arrow_down

General Information section includes detailed routing diagrams that show the placement of throttle cables, fuel hoses, and electrical harness paths. These illustrations are provided to show the intended routing for major vehicle components.

Is there a table listing tightening torque specifications for the major fasteners? keyboard_arrow_down

Document features specialized torque tables in the General Information section that list the required tightening specifications for major fasteners across various motorcycle systems.

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