1996-2000 Yamaha T25Y Outboard Motor Supplementary Service Manual

Yamaha T25Y troubleshooting and repair reference manual covering 1996-2000 models, including engine, lower unit, and electrical systems. LIT-18616-02-20.

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Yamaha Models Covered & Key Technical Specifications

Models: Yamaha T25Y, FT25BED, FT25BET, T25ER, T25TR
Sub-models / Variants: 4-stroke OHC In-line, L (long shaft), X (extra-long shaft), Remote control, Power trim and tilt (ET/TR), ED/ER (Manual trim variants)
Build Years: 1996–2000
Serial Numbers: L: 810101-, X: 855101-, L: 840101-, X: 885101-
Technical Data:

  • Engine displacement: 498 cc
  • Configuration: 2-cylinder, 4-stroke OHC in-line
  • Maximum output: 18.4 kW (25 HP) at 5,500 r/min
  • Full throttle range: 5,000–6,000 r/min
  • Compression pressure: 1,180–1,250 kPa
  • Gear ratio: 2.42 (29/12)
  • Starter motor output: 1.1 kW
  • Ignition timing: 7.5–30.0 ± 3 degrees BTDC
Technical Specifications
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Document Number / Seller:
30067 / Walter Edwards
File Size:
31.44 MB
File Type:
PDF
Language:
English
Pages:
795
Printable:
Yes
Category:
Outboard Motor
Last updated / verified
Jan 2, 2026

Yamaha Manual Features & Content Preview

Yamaha T25Y 1996–2000 Outboard Service Coverage

  • Covers 1996–2000 Yamaha T25Y and related FT25BED/FT25BET outboard motor variants, including long and extra-long shaft models with remote control or power trim and tilt.
  • Official Yamaha supplementary service publication LIT-18616-02-20, first edition February 2000.
  • Contains 47 exploded-view assembly diagrams and 18 technical system illustrations.
  • Delivered as a direct download the moment payment clears.
  • Permanent availability in your purchase account — no re-buy required.
  • Print resolution preserves exploded-view detail.
  • Indexed PDF search covers every chapter and appendix.
  • This 1999–2000 supplementary manual provides the essential modifications and additional data required for the T25Y, serving as the required extension for the F25X base service reference.

Technical Documentation Scope

This technical guide details the maintenance and assembly specifications for the Yamaha T25Y outboard series. The documentation opens with identification markers, special tool requirements, and general specifications, followed by extensive chapters on periodic inspection and adjustments. The manual segments focus on the power unit, lower unit, bracket unit, and electrical system, providing clear assembly sequences for critical components such as the camshaft, valves, water pump, and shift rod assembly.

Precision Data and Reference Values

Included technical tables define torque specifications for fasteners ranging from M5 to M16, with values provided in Nm, m•kgf, and ft-lb units. The manual documents compression pressure at 1,180–1,250 kPa and specifies ignition timing between 7.5–30.0 degrees BTDC. Engine lubrication requirements list SAE #90 gear oil for the lower unit, while 4-stroke engine oil grades 10W-30 through 20W-40 are specified for the power unit. Electrical testing sections detail peak voltage reference values for charging, ignition, and enrichment control systems. Valve clearance is specified as 0.2 ± 0.05 mm for intake and 0.3 ± 0.05 mm for exhaust at cold temperatures. This official 795-page Yamaha supplementary service manual provides all necessary technical data and configuration details to support the 1996–2000 T25Y and FT25BED/FT25BET outboard motor builds.

Manual FAQ, Purchase & Download Details

Is the manual available as an instant PDF download for use on multiple devices? keyboard_arrow_down

Publication is provided in PDF format and is accessible for download immediately following a successful transaction.

Can I use this supplementary service manual to preview information for the Yamaha T25Y and related F25X models? keyboard_arrow_down

Manual covers modifications and additional information for the T25Y, while explicitly noting its relationship to the F25X base service manual. It includes model indication tables to clarify which variations are addressed within these pages.

Does this document include dedicated chapters for major systems like the power unit, lower unit, and electrical components? keyboard_arrow_down

Document contains comprehensive chapters organized by major system including the power unit, lower unit, bracket unit, and electrical systems.

Are there service data tables included that list fluid types and total capacities for the engine and gear oil? keyboard_arrow_down

General specifications section lists the required engine oil grades and gear oil types for the outboard motor. These tables also provide the total capacity values for operations with and without oil filter cartridge replacement.

Which specific technical details are contained in the maintenance and general specification tables? keyboard_arrow_down

Specification tables include extensive data such as bore and stroke measurements, compression pressure ranges, and valve clearance settings for cold engine conditions. These sections also list tightening torque ranges for various fasteners and define the allowable tolerance limits for components like cylinder heads and pistons. This collection of technical data is intended to provide reference values for all models covered in the publication.

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