Honda C50 / C50M / C50MK1 / S50 Service Manual

Documents Honda C50, C50M, C50MK1, and S50 series service procedures, covering engine, frame, and electrical systems. Ref: SM 50/65.

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Honda Models Covered & Key Technical Specifications

Models: Honda C50, Honda C50M, Honda C50MK1, Honda S50
Sub-models / Variants: C50, C50M, C50MK1, C65, C65M, S50, S65
Build Years: Mid-1960s era Honda 50 and 65 series
Technical Data:

  • Standard Tappet Clearance: 0.05 mm (0.002 in) for intake and exhaust
  • Cylinder Compression: 12 kg/cm² (170 lb/in²)
  • Engine Oil Capacity: 0.8 liters (1.7 U.S. pt)
  • Spark Plug Gap: 0.6–0.7 mm (0.024–0.028 in)
  • Fuel Tank Capacity: Approximately 4 liters
  • Drive Chain: RK420-B high strength chain
  • Transmission: 3-speed (C50/C65) or 4-speed (S50/S65)
Technical Specifications
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Document Number / Seller:
26364 / Dorothy Allen
File Size:
37.13 MB
File Type:
ZIP
Language:
English
Printable:
Yes
Category:
Bike
Last updated / verified
Jun 10, 2025

Honda Manual Features & Content Preview

Honda C50, C50M, C50MK1, and S50 Official Service Manual

  • Covers 1960s-era Honda C50 and S50 series motorcycles, including C50, C50M, C50MK1, C65, C65M, and S65 performance variants
  • Original OEM publication SM 50/65
  • Contains 50+ detailed exploded-view technical illustrations and system diagrams
  • File delivered as a direct download the moment payment clears
  • Indexed PDF search covers every chapter and appendix
  • Stored against your account so you can retrieve it after a hard-drive loss
  • This 100-page archive is the primary reference used for the Honda C50 and S50 series launch builds, featuring technical specifications for carburetor jetting and engine clearances unique to these specific frames

Technical Walkthrough and Content

This Honda C50 service manual documents the complete architecture of the 50 series motorcycle, detailing O.H.C. engine internal systems, power transmission, and specialized frame components. The documentation segments the engine into core systems, explaining the trochoid oil pump, cylinder head design, and cam chain tensioner, alongside the carburetor configurations for both the C50/C65 and S50/S65 lines. Understanding factory workshop documentation for vintage Honda bikes provides the necessary context for interpreting the included torque tables and service tolerances.

Engine and Electrical Specifications

Technical data is provided for critical identification and set-up, including standard clearances, pressure ratings, and electrical component testing. The manual contains indexed charts for carburetor setting specifications, specifying needle clip positions and jet sizes for the PW16FA-series carburetors. Spark plug reach and heat ranges are also documented. Engine compression pressure is 12 kg/cm² (170 lb/in²) as listed in the periodic adjustment section. The Honda C50, C50M, C50MK1, and S50 ignition breaker point gap is specified at 0.3–0.4 mm (0.012–0.016 in). An official 100-page Honda OEM workshop manual covering the C50 and S50 series, documenting engine, chassis, electrical, and fuel-delivery specifications for the original O.H.C. build.

Document Reference: SM 50/65, Honda Motor Co., Ltd. Service Publications Office

Manual FAQ, Purchase & Download Details

Can you summarize which systems are covered by the engine and chassis chapters in this service manual? keyboard_arrow_down

Document covers a wide array of systems including the engine lubrication, cylinder head, transmission, and frame components. Detailed sections also address the electrical system, including the generator, ignition coil, and various starting components.

Which tables appear in the document for lookup and technical reference data? keyboard_arrow_down

Manual includes various specification tables, tool reference charts for the engine and frame, and adjustment data for carburetors across the different covered model variants.

What specific model and series information is provided in the document for compatibility review? keyboard_arrow_down

Manual is designed for the Honda 50 series, specifically listing the C50, C50M, C50MK1, and S50 models. It also references the C65 and S65 series, providing technical data and descriptions applicable to these specific variants.

Does this manual include diagrams showing the internal breakdown of components for the engine or frame? keyboard_arrow_down

Yes, the manual contains numerous exploded views, cutaway illustrations, and system diagrams for components such as the cylinder head, oil pump, and carburetor assemblies.

Are there details regarding the PDF format and access for this service manual? keyboard_arrow_down

Product is delivered as a high-quality PDF document accessible on various digital devices. You receive instant download access upon purchase, providing you with a permanent reference archive in English. This format is designed for clear viewing of all diagrams and technical tables included in the publication.

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