Yamaha 50G-90A Outboard Service Manual

Shop manual for Yamaha 50G-90A outboard motors covering 1995-2003 models. Includes engine, fuel, electrical, and power trim systems. PN LIT-18616-01-39

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Technical Safety Notice
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This official OEM document is intended for professional technicians and skilled operators. Performing service on mechanical equipment involves inherent risks. By purchasing, you acknowledge that RepairLoader provides original manufacturer data for informational purposes. Always prioritize safety: use correct tools, wear protective gear, and consult a certified professional if you are uncertain of any procedure.

Yamaha Models Covered & Key Technical Specifications

Models: 50G, 60F, 70B, 75C, 80A, 90A, P60U, C60U, 70U, P75U, 90U, 50GEO, 50GETO, 60FE, 60FEO, 60FET, 60FETO, 60FEMO, 70BEO, 70BETO, 75CEHTO, 75CETO, 80AEO, 80AETO, 90AEO, 90AETO, C60ER, C60TR, P60TH, 70TR, P75TH, 90TR
Sub-models / Variants: Manual control, Remote control, Manual tilt, Power trim and tilt, 2-stroke, L (long), UL (ultra-long), S (short)
Trade Names: Yamaha Marine Outboards
Build Years: 1995–2006
Serial Numbers: S: 100212~ / L: 400787~ (50GEO), S: 200181~ / L: 501521~ (50GETO), S: 001043~ / L: 305096~ (60FE/C60ER), S: 050454~ / L: 352257~ (60FET/C60TR), S: 100825~ / L: 406709~ (60FEO), S: 150688~ / L: 467727~ / UL: 731661~ (60FETO), L: 551339~ (P60TH), S: 100216~ / L: 401862~ (70BEO), S: 150366~ / L: 487236~ / UL: 731037~ (70BETO/70TR), L: 900101~ (P75TH), L: 950101~ (75CETO), L: 401108~ (80AEO), L: 457240~ / UL: 850891~ (80AETO), L: 401086~ (90AEO), L: 491155~ / UL: 855248~ (90AETO/90TR)
Technical Data:

  • Engine type: 3-cylinder, 2-stroke
  • Engine displacement: 849 cc (50-70 hp), 1141 cc (75-90 hp)
  • Full throttle RPM range: 4500–5500 RPM (50-80 hp), 5000+ RPM (90 hp)
  • Idle speed: 800 ± 50 RPM
  • Ignition system: C.D.I. (Capacitor Discharge Ignition)
  • Spark plug gap: 0.9–1.0 mm (0.035–0.039 in)
  • Gear ratio: 14:24 (50 hp), 12:28 (60-70 hp), 13:26 (75-90 hp)
  • Fuel: Regular gasoline (min. 86 octane)
  • Engine oil: TC-W3
  • Gear oil: Hypoid gear oil SAE #90
  • Battery capacity: 70 Ah (252 kC)
Technical Specifications
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Document Number / Seller:
30060 / Joshua Harris
File Size:
63.00 MB
File Type:
PDF
Language:
English
Pages:
1333
Printable:
Yes
Category:
Outboard Motor
Last updated / verified
May 26, 2025

Yamaha Manual Features & Content Preview

Yamaha Marine Outboards 50G–90A Service Documentation

  • Covers 1995–2006 Yamaha 50G through 90A series 2-stroke outboards, including P60U, C60U, 70U, P75U, 90U, and remote-control or power trim variants
  • Official Yamaha publication P/N 6H2-28197-Z5-11, first edition September 1995
  • Contains 47 detailed exploded-view diagrams, 13 electrical wiring and connector charts, and 5 comprehensive torque-specification tables
  • Downloads to your account within seconds of checkout
  • Your order stays downloadable from your account for life
  • Laid out for standard letter and A4 printing
  • Full-text search finds any part number in seconds
  • This 1995 first edition is the base factory publication for the global 50G–90A series, documenting the transition from earlier 2-cylinder to the 3-cylinder engine layouts found in these models

Technical Content Overview

This Yamaha 50G–90A service manual contains what an OEM service publication covers for these 2-stroke outboard units. Major chapters detail engine power head removal, complete lower unit disassembly, ignition system calibration, fuel injection and carburetion adjustments, and comprehensive bracket unit maintenance. Every component group receives dedicated analysis sections including troubleshooting flow charts and specific inspection criteria for the reed valve, thermostat, and oil injection pump drive gears.

Precision Data and Reference Tables

The manual includes essential specifications for the 50G through 90A series engines. Cylinder head warpage limit for all models is specified at 0.1 mm in the engine maintenance table. Piston-to-cylinder clearance for the 50–70 hp series is documented at 0.050–0.055 mm. Ignition timing for 90 hp units at full advanced is documented at 22° ± 1° BTDC. The manual contains fluid capacities, bolt torque values, and electrical resistance measurements for the charging, pulser, and ignition coils. Reference only — always consult a certified technician before performing service on this equipment. A complete 1333-page Yamaha OEM service publication covering the 1995–2006 50G–90A outboard range, documenting engine, chassis, lower unit, and fuel-injection specifications for the specified models.

Manual FAQ, Purchase & Download Details

Is there a reference in the manual for tightening torque specifications and general maintenance tolerance values? keyboard_arrow_down

Specification tables within the manual include sections dedicated to maintenance specifications, engine data, and tightening torque values. These tables are organized to provide technical reference categories for the various covered outboard models.

Can I see which major system chapters are covered by this service manual? keyboard_arrow_down

Manual contains chapter sections that cover the fuel system, power unit, lower unit, bracket unit, and the electrical system.

Does the document provide technical details regarding engine dimensions and operational output? keyboard_arrow_down

Specification pages list details such as overall length, width, and height for the various models. The data also includes full throttle speed ranges and power output configurations. This information is intended to support an understanding of the outboard motor specifications.

Are the publication details and total page count listed for this service manual? keyboard_arrow_down

Document is a 1333-page service manual, published as the first edition in September 1995 under publication number P/N 6H2-28197-Z5-11.

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