Yamaha CV25 Outboard Motor Service Manual

1990 Yamaha Marine CV25 Service Manual for outboard motors. Includes pre-delivery, periodic maintenance, fuel system, power unit, and electrical system procedures. LIT-18616-00-55.

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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: Yamaha CV25
Sub-models / Variants: CV25ED, CV25EMD
Build Years: 1990
Serial Numbers: L:328669~
Technical Data:

  • Engine type: 2-stroke
  • Displacement: 430 cc
  • Max output: 18.7 kW (25 HP) at 5,000 r/min
  • Bore and stroke: 67 mm x 61 mm
  • Compression ratio: 7.0
  • Cooling system: Water
  • Lubrication system: Premix (100:1)
  • Fuel tank capacity: 24 Liters
  • Spark plug: B7HS (NGK)
  • Ignition system: C.D.I.
Technical Specifications
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Document Number / Seller:
28640 / Patrick Williams
File Size:
164.10 MB
File Type:
ZIP
Language:
English
Printable:
Yes
Category:
Outboard Motor
Last updated / verified
Aug 28, 2025

Yamaha Manual Features & Content Preview

Yamaha CV25 1990 Outboard Motor Service Documentation

  • Covers the 1990 Yamaha CV25 outboard, including the CV25ED remote control and CV25EMD manual control variants
  • Official Yamaha publication P/N LIT-18616-00-55, first edition April 1990
  • Contains 8 exploded-view system diagrams, 15 maintenance specification tables, and 3 distinct wiring schematic illustrations
  • 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 1990 first edition provides the baseline assembly and service tolerances established for the original production run of the CV25 series

Service Chapter Walkthrough

This Yamaha CV25 publication details the full maintenance and assembly parameters for the 1990 outboard motor lineup. Chapters are structured by primary system, beginning with comprehensive general information, identification protocols, and special service tool lists. Subsequent technical sections detail the fuel delivery assembly, power unit overhaul, lower unit transmission and gear case geometry, and bracket unit installation. Electrical system coverage includes ignition timing, component resistance tables, and specific wiring paths for both electric and manual start configurations.

Engine and Maintenance Specifications

Technical depth for the 1990 Yamaha CV25 includes precise tolerance data for piston-to-cylinder clearances and crankcase assembly. Cylinder head warpage limit is documented at 0.1 mm in the power unit maintenance tables. The crankcase assembly requires 100 Nm (73.7 ft-lb) torque during final mounting procedures. The CV25 flywheel nut tightening torque is specified at 100 Nm (73.7 ft-lb) in the assembly data. Additional service manual details assist with component verification and assembly sequence mapping. This technical reference manual is designed for the 1990 Yamaha CV25, documenting engine, fuel, electrical, and lower unit specifications for the CV25ED and CV25EMD variants.

Manual FAQ, Purchase & Download Details

Which chapters contain exploded diagrams and assembly overviews for the Yamaha CV25 power unit and lower unit systems? keyboard_arrow_down

Manual includes dedicated chapters that provide exploded diagrams, component lists, and assembly references for both the power unit and lower unit subassemblies.

Are the electrical system sections equipped with wiring diagrams and component location references for the CV25ED and CV25EMD models? keyboard_arrow_down

Yes, the electrical system chapter contains wiring diagram references tailored to these specific outboard models. It also lists technical data for components such as the starter motor, charging coils, and ignition system.

Is this manual provided in a digital PDF format that allows for permanent storage on personal devices? keyboard_arrow_down

Product is delivered as an instant digital download in PDF format. It is designed to be accessible on multiple devices and remains available for your use after the download is complete. The document is provided in English to match the original technical publication.

What publication information is displayed on the document cover page? keyboard_arrow_down

Cover displays the publication number LIT-18616-00-55 and identifies the document as the official first edition service manual released in April 1990.

Does the specification section list fluid capacities and lubricant charts for the outboard motor? keyboard_arrow_down

Maintenance and general specification tables list required fluid types and capacities for the fuel system and gear case. These sections provide reference data for lubricant selection and mixing ratios.

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