1979-1985 Honda XL 125S Service Manual

Documents 1979-1985 Honda XL 125S motorcycle service procedures, including detailed diagrams and specifications for all major components. Publication P-6643701.

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Document Details

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Document Number / Seller:
26467 / Peter Lopez
File Size:
6.63 MB
File Type:
ZIP
Language:
English
Printable:
Yes
Category:
Bike
Last updated / verified
Aug 17, 2025

Models Covered & Key Technical Specifications

1979-1985 Honda XL 125S Service Manual

Honda XL 125S (P-6643701) -- 1979-1985 Technical Dossier | Volume

  • Documented Threaded Fastener Data: 10 N-m is standardized to proper bolt security for engine components.
  • Technical Fluid Levels: For optimal operation, 1.1 liters defines the engine oil capacity.
  • Universal Deviation Limits: 0.05 mm -- signifies the maximum allowable wear for piston ring end gap.
  • Core Operating Temps: The intake valve clearance requires 0.05 mm (0.002 in) for standard operation.
  • Rated Angular Speed: Maximum throughput reaches 9,500 rpm for engine performance.
  • Prescribed Rotational Force: 40-50 N-m signifies the tightening torque for the clutch lifter plate.

Professional Workshop Service Manual & Technical Specifications

1979-1985 Honda XL 125S Service Manual: Honda XL 125S Manual (1979-1985) Information-Suite

Technical-Scope: 1979-1985 Honda XL 125S // Assembly-Group: Bike / Engine Logic // Technical-Scope: Maintenance Schedule and Specifications.

Specification Baseline Architecture
Engine Oil Capacity 1.1 liters (1.0 US gal, 0.8 Imp gal) At disassembly
Rear Shock Absorber Spring Free Length 302.1 mm (11.89 in) Standard
Rear Wheel Rim Runout Radial: 2.0 mm (0.08 in) Axially Specified
Front Brake Lining Thickness 4 mm (0.2 in) Standard Measurement
Piston Pin Bore 15.002-15.008 mm (0.5906-0.5909 in) Component Specification
Spark Plug Gap 0.6-0.7 mm (0.024-0.028 in) Critical Gap Measurement

The documentation provides guidance on: General Information, Lubrication, Inspection and Adjustment, Fuel System, Engine Removal/Installation, Cylinder Head/Valves, Cylinder/Piston, Clutch/Oil Pump, A.C. Generator, Transmission/Crankshaft/Kickstarter, Front Wheel/Brake/Suspension/Steering, Rear Wheel/Brake/Suspension, Rear Fender/Exhaust Pipe, Battery/Charging System, Ignition System, Switches, and Troubleshooting.

System operation descriptions cover engine removal and installation procedures, including component identification and sequence of operations. The documentation addresses detailed specifications for various assemblies, such as cylinder head, piston, and transmission components, ensuring adherence to manufacturer standards. Assembly instructions are detailed for critical systems like the clutch and oil pump, outlining specific torque values and component placements. Hydraulic schematics are included for the rear suspension system, aiding in diagnosis and repair. Steering component information is provided for the front fork and steering stem, including critical alignment and adjustment procedures.

This manual details torque specifications for critical engine and frame components to ensure proper pressure slip prevention and secure assembly.

FAQ

Check the **standard** component identification for the carburetor. keyboard_arrow_down

PD15B is the standard identification mark for the carburetor, appearing in both UK, France, Swiss, European, and Australian versions. For the South African General version, the identification mark is PD21C.

What are the **necessary** adjustment procedures for the ignition timing? keyboard_arrow_down

1300 ± 150 rpm is the specified idle speed for ignition timing adjustment. The 'F' mark on the generator rotor should align with the index mark on the left crankcase cover at this speed.

Reference the **recommended** pressure specifications for the front fork. keyboard_arrow_down

150 kPa (1.5 kg/cm², 21.3 psi) is the recommended pressure for the front axle and front fork spring free length. For the front brake lining thickness, the specification is 4 mm (0.2 in).

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This repair manual has everything I needed to get my Honda XL185 back in shape. The download process was seamless, and I received a quick email with the link. Highly recommend!