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Yamaha 250GETO User Manual

Yamaha 250GETO
293 pages
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L250G
SERVICE MANUAL
6S3-28197-5H-11
6
250G
YAMAHA MOTOR CO., LTD.
Printed in Japan
Aug. 2005 – 1.4 × 1 !
(E_2)
Printed on recycled paper
250G, L250G
A3Cover 06.6.9 19:09 Page 1

Table of Contents

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Yamaha 250GETO Specifications

General IconGeneral
Engine Type2-Stroke
Horsepower250 hp
Starting SystemElectric
Shaft Length25 inches
Trim MethodPower Trim & Tilt

Summary

General Information

How to Use This Manual

Guide on manual format, symbols, safety, and procedures for effective service.

Symbols

Explanation of chapter and data indication symbols used throughout the manual.

Safety While Working

Essential safety procedures to prevent accidents and ensure quality service.

Identification

Information on applicable models and serial number location.

Special Service Tools

List of specialized tools required for maintenance and repair procedures.

Features and Benefits

Details on key features and design benefits of the power unit components.

Propeller Selection

Guidance on selecting the correct propeller for optimal boat performance.

Predelivery Check

Comprehensive checklist for ensuring the outboard motor is ready for delivery.

Specification

General Specification

Key dimensions, weight, performance, and general specifications for the models.

Maintenance Specification

Specific measurements and tolerances for engine parts during maintenance.

Tightening Torque

Specified torques for various fasteners and components for proper assembly.

Periodic Check and Adjustment

Maintenance Interval Chart

Schedule for routine checks and maintenance based on operating hours.

Top Cowling

Procedure for checking the fit and security of the top cowling.

Fuel System Checks

Inspection of fuel hoses, filter, pumps, and carburetor for leaks.

Power Unit Checks

Inspection of engine oil, spark plug, thermostat, and cooling system.

Control System Checks

Procedures for synchronizing carburetors and checking throttle sensor.

Bracket Checks

Inspection of PTT operation and fluid level for bracket system.

Lower Unit Checks

Procedures for checking gear oil level and lower unit for leaks.

General Checks

Inspection of anode, battery, and lubrication points on the outboard motor.

Fuel System

Hose Routing

Diagram illustrating the correct routing of fuel and oil hoses.

Fuel Line Components

Exploded view and part list for the fuel line system.

Carburetor Service

Detailed procedures for disassembling, checking, and assembling carburetors.

Fuel Pump Service

Instructions for checking, disassembling, and assembling the fuel pump.

Oil Injection System

Procedures for checking and assembling the oil tank and oil pump.

Power Unit

Power Unit Checks

Procedure for checking engine compression pressure.

Intake Manifold Service

Instructions for removing and checking the intake manifold and reed valves.

Exhaust Cover Service

Procedures for removing, checking, and installing the exhaust cover and PCV.

Cylinder Head Service

Steps for removing and checking the cylinder head for warpage.

Crankcase Service

Detailed procedures for disassembling and checking crankcase components.

Lower Unit

Lower Unit (Regular Rotation Model)

Disassembly and assembly procedures for the lower unit.

Propeller Shaft Housing (Regular Rotation Model)

Service procedures for the propeller shaft housing assembly.

Drive Shaft and Lower Case (Regular Rotation Model)

Disassembly and assembly of the drive shaft and lower case.

Shimming (Regular Rotation Model)

Calculations and procedures for selecting and installing shims.

Backlash (Regular Rotation Model)

Methods for measuring and adjusting gear backlash.

Bracket Unit

Bottom Cowling Service

Procedures for removing and installing the bottom cowling.

Upper Case and Steering Arm Service

Steps for disassembling and assembling the upper case and steering arm.

Clamp Bracket and Swivel Bracket Service

Procedures for removing and installing clamp brackets and swivel bracket.

PTT Unit Service

Detailed procedures for servicing the PTT unit components.

PTT Motor Service

Instructions for disassembling, checking, and assembling the PTT motor.

Gear Pump Service

Procedures for disassembling, checking, and assembling the gear pump.

Tilt Cylinder and Trim Cylinder Service

Steps for disassembling and assembling the tilt and trim cylinders.

PTT Electrical System Checks

Tests for checking the continuity and resistance of PTT electrical components.

Electrical System

Checking Electrical Components

Procedures for measuring peak voltage of electrical components.

Electrical Component Views

Diagrams showing the location of electrical components (Port, Starboard, Junction Box).

Ignition and Ignition Control System

Checks for spark plugs, caps, coils, CDI unit, pulser coil, and sensors.

Starting System Checks

Procedures for checking fuses, start switch, lanyard switch, and starter relay.

Starter Motor Service

Steps for removing, checking, and assembling the starter motor.

Charging System Checks

Procedures for checking lighting coil, rectifier regulator, and hour meter.

Oil Feed Pump Control System

Checks for oil level sensor, emergency switch, and oil pump operation.

Troubleshooting

Troubleshooting the Power Unit

Diagnosing power unit issues using a diagnostic flash indicator.

Troubleshooting Power Unit (No Trouble Code)

Troubleshooting engine problems without diagnostic codes.

Troubleshooting the PTT Unit

Diagnosing and resolving issues with the PTT unit operation.

Troubleshooting the Lower Unit

Resolving problems related to the lower unit shift mechanism.

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