Honda CB100, CL100, SL100, CB125S, CD125S, SL125 1971–1985 Service Manual OEM

• Covers 1971–1985 Honda CB100, CL100, SL100, CB125S, CD125S, SL125, and TL125 variants (100cc and 125cc single-cylinder powerplants).
• Original OEM factory data based on the 1971 first edition litho in Japan, acting as the primary reference for the launch build.
• Packed with 21 detailed exploded-view diagrams, 10 electrical wiring schematics, and 14 technical specification tables.

Shop Utility and Technical Scope

Time is money in the shop. This 101-page manual cuts through the guesswork by breaking down the engine, chassis, and electrical systems into five dedicated mechanical sections, supplemented by a comprehensive TL125 appendix. It provides the exact factory reference points needed for routine maintenance and complex teardowns alike.

The guide walks you through critical baseline adjustments, including valve tappet clearances, carburetor idle and mixture, ignition timing, and clutch free-play. It also outlines strict inspection procedures for engine oil, drive chain tension, and the 6V electrical charging circuits. When you need to split the cases, the drivetrain chapters map out the exact assembly sequence for the clutch, transmission, and crankshaft, while the chassis sections cover the front and rear suspension, brake systems, and steering unit components.

Factory Specifications and Tolerances

Don't rely on forum guesses when setting up vintage singles. This documentation delivers the mandatory wear limit tolerances for pistons, cylinder bores, and valve seats. Engine rebuilders will find critical baselines, such as the standard cylinder compression pressure at 12 kg/cm² (170 psi) and the specific intake valve clearance of 0.05 mm. You also get detailed electrical testing benchmarks, including the required 10 MΩ magneto pick-up coil insulation resistance.

Working on vintage motorcycle components carries inherent risks, especially around pressurized fluids, moving engine parts, and electrical circuits. Always follow standard workshop safety protocols and verify your setup against these original factory values.