Yamaha 20Hp Outboard Service Manual 20B 71080 1979


Yamaha 20Hp Outboard Service Manual 20B (1979)

88 pages. Covers models: 20BE and 20BM

Status: Ready for Download (admin fee applies*)

*due to the volume of requests we now have a small admin charge for COMPLETE MANUAL downloads 


Yamaha 20Hp (18.4HP) Outboard Service Manual 20B (1979)

A4 Service manual with 6 chapters and 88 pages covering nomenclature, specification, engine, mounting, lubrication/fuel and engine oil mix, off-season storage, operating instructions, submerged procedure, maintenance guidance. Comprehensive troubleshooting section with multiple fishbone diagrams for starting, fuel problems, poor running etc.

Model coverage summary:

  • 2-cylinder 2-stroke
  • Fuel/Oil mix ration of 100:1
  • Dog Clutch
  • F/R/N
  • 392cc Displacement
  • 6.7 Compression ratio

Covers models: 20BE 20BM (18.4HP)

Good condition for age with some fading and staining. Structually sound.

Printed in Japan in 1979 (English and German) (note download is manual download is English only)

Part no: 693-28197-EO

View other Yamaha Outboard Manuals


Additional information

Weight.2 kg
Dimensions18 × 13 × 2.5 cm

Purchase Printed Manual, Download Table of Contents, Download Complete Manual


Black and White


n/a 77 pages





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