Yamaha 50G - User Manual

Other manuals for Yamaha 50G

Service Manual204 pages

Questions and Answers

J
Jody SchwartzAug 1, 2025
Why Yamaha 50G starter will not operate?
- A
  Alison HaleAug 1, 2025
  If your Yamaha Outboard Motor's starter won't operate, several factors could be at play. The battery capacity might be weak or low, requiring you to check its condition and potentially use a battery with the recommended capacity. The battery connections could be loose or corroded; ensure you tighten the battery cables and clean the terminals. A blown fuse in the electric start circuit could also be the culprit, so check for any electric overload, repair it, and replace the fuse with one of the correct amperage. Other potential causes include faulty starter components (have these serviced by a Yamaha dealer), the engine stop switch lanyard not being attached (attach the lanyard), or the shift lever being in gear (shift to neutral).
D
Dean JacksonAug 11, 2025
What to do if Yamaha 50G Outboard Motor engine will not start but starter operates?
- J
  Jacqueline WallerAug 11, 2025
  If your Yamaha Outboard Motor engine won't start but the starter operates, here's what to check: The fuel tank may be empty, so fill it with clean, fresh fuel. The fuel could be contaminated or stale, requiring you to replace it with clean, fresh fuel. A clogged fuel filter needs cleaning or replacement. Make sure you are using the correct starting procedure. Inspect, clean, or replace fouled or incorrect spark plugs with the recommended type. Ensure spark plug caps are correctly fitted. Check for wear or breaks in the ignition wires, tighten loose connections, and replace worn or broken wires. Also, attach the engine stop switch lanyard and shift to neutral. For fuel pump malfunctions, faulty ignition parts, damaged engine inner parts, have it serviced by a Yamaha dealer.
N
Noah WilsonAug 26, 2025
How to fix excessive vibration in Yamaha Outboard Motor?
- S
  Sherri AnthonyAug 26, 2025
  Excessive vibration in your Yamaha Outboard Motor can stem from several issues. A damaged propeller should be repaired or replaced. A damaged propeller shaft or steering pivot requires servicing by a Yamaha dealer. Remove any weeds or foreign matter tangled on the propeller. Check for and tighten any loose motor mounting bolts. Also, tighten or have serviced a loose or damaged steering pivot by a Yamaha dealer.
A
andreareidNov 4, 2025
Why does the warning buzzer sound on my Yamaha Outboard Motor?
- C
  Connie TuckerNov 5, 2025
  If the warning buzzer sounds or the indicator lamp lights on your Yamaha Outboard Motor, it could be due to several reasons. The cooling system might be clogged, so check the water intake for any restrictions. The engine oil level could be low, requiring you to fill the oil tank with the specified engine oil. An incorrect heat range of the spark plug necessitates inspecting and replacing it with the recommended type. Ensure you are using the specified engine oil and replace it if it's contaminated or deteriorated. If the oil filter is clogged or the oil feed/injection pump malfunctions, have it serviced by a Yamaha dealer. Improper load distribution on the boat can also trigger the warning, so distribute the load evenly. Lastly, a faulty water pump or thermostat should be serviced by a Yam...
D
David MatthewsNov 14, 2025
Why is my Yamaha 50G Outboard Motor losing power?
- J
  johnstarkNov 15, 2025
  If your Yamaha Outboard Motor engine experiences power loss, several factors could be responsible. A damaged propeller should be repaired or replaced. An incorrect propeller pitch or diameter requires installation of the correct propeller to operate the outboard at its recommended speed range. Adjusting the trim angle can help achieve more efficient operation. If the motor is mounted at an incorrect height on the transom, it should be adjusted to the proper transom height. Additionally, check for warning system activations and correct their causes. Clean the boat bottom if it's fouled with marine growth. Inspect, clean, or replace fouled or incorrect spark plugs, remove any foreign matter tangled on the gear housing, and clean the lower unit. Obstructions in the fuel system, a clogged fuel...
C
cwoodardNov 20, 2025
Why does my Yamaha 50G idle irregularly?
- J
  Justin HillNov 20, 2025
  If your Yamaha Outboard Motor engine idles irregularly or stalls, several factors could be the cause. Start by inspecting the spark plugs and cleaning or replacing them if they are fouled or of an incorrect type. Check for any obstructions in the fuel system, such as pinched or kinked fuel lines. Ensure the fuel is clean and fresh, and replace the fuel filter if it's clogged. Other potential issues include failed ignition parts, which should be serviced by a Yamaha dealer; activation of the warning system, requiring you to identify and correct the cause; an incorrect spark plug gap, which should be inspected and adjusted; and poor connections or damaged ignition wiring, which should be checked and repaired. Also, be sure that you are using specified engine oil. For thermostat issues, carbu...

Summary

Chapter 1 General Information

Identification Numbers Record

Record of outboard motor and key serial numbers for identification and reference.

Safety Information

Essential safety precautions for operating the outboard motor and boat.

Fueling Instructions

Procedures and precautions for safely refueling the outboard motor with gasoline and oil.

Chapter 2 Basic Components

Main Components

Identification of major parts and their functions on the outboard motor.

Operations of Controls and Other Functions

Detailed explanation of how to operate various controls and functions of the outboard motor.

Chapter 3 Operation

Installation

Guidelines and warnings for properly mounting the outboard motor on a boat.

Filling Fuel and Engine Oil

Instructions for filling the fuel tank and engine oil tank with correct procedures.

Starting Engine

Step-by-step guide for starting the outboard motor safely and correctly.

Chapter 4 Maintenance

Specification Data

Technical specifications for various Yamaha outboard motor models.

Transporting and Storing Outboard Motor

Procedures for safely transporting and storing the outboard motor.

Periodic Maintenance

Recommended maintenance schedule and tasks for the outboard motor.

Chapter 5 Trouble Recovery

Troubleshooting

A chart detailing common troubles, their possible causes, and recommended remedies.

Temporary Action in Emergency

Immediate actions to take in emergency situations related to motor damage or malfunction.

Chapter 6 Index

Index

Alphabetical listing of topics and their corresponding page numbers for easy reference.

Yamaha 50G Specifications

General

Engine Type	2-Stroke
Horsepower	50 hp
Cylinder(s)	3
Starting System	Electric
Fuel Type	Gasoline
Fuel Induction System	Carburetor
Ignition System	CDI
Cooling System	Water-cooled
Full Throttle RPM Range	4500-5500 RPM
Gear Ratio	1.85:1
Shaft Length	20 inches