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Yamaha 20DMHO - User Manual

Yamaha 20DMHO
226 pages
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Table of Contents

Questions and Answers

  • W
    Walter MurphyAug 18, 2025
    What to do if Yamaha 20DMHO Outboard Motor fuel management gauge shows incorrect fuel consumption?
    • W
      washingtonchelseaAug 18, 2025
      If the fuel management gauge shows incorrect fuel consumption, the engine recognition might be wrong (especially for multi-applications). To fix this, default the engine number and turn the key switch on in order from the portside engine to re-memorize each engine number.
  • L
    Lucas AshleyAug 20, 2025
    What to do if the Yamaha 20DMHO Outboard Motor gauge display does not wake up?
    • I
      Ian SimonAug 20, 2025
      If the gauge display doesn't wake up, it could be due to a lack of electrical power or a damaged gauge. Try these steps: replace the fuse, securely connect the couplers, replace any damaged wires or hubs, or, if necessary, replace the gauge itself.
  • B
    brandon55Aug 23, 2025
    Why Yamaha Outboard Motor illumination does not light?
    • K
      Katie WashingtonAug 23, 2025
      If the illumination does not light, it could be due to a lack of electrical power or a damaged gauge. You should try replacing the fuse, connecting the couplers securely, replacing the damaged wire or hub, or replacing the gauge.
  • N
    Nathan BradyAug 26, 2025
    How to fix Yamaha Outboard Motor tachometer showing incorrect engine RPM?
    • M
      Molly OliverAug 26, 2025
      If the tachometer shows an incorrect engine RPM, the engine recognition might be wrong (especially for multi-applications). To correct this, push the 'SET' button for 10 seconds to default the engine number, then memorize each engine number again.
  • J
    Jennifer DoughertyAug 27, 2025
    What causes Yamaha Outboard Motor fuel management gauge to show incorrect remaining fuel?
    • D
      david10Aug 27, 2025
      If the fuel management gauge shows incorrect remaining fuel, the fuel capacity setting may be wrong (specifically for SQR Fuel mgt Gauge). Fill the tank with fuel, and set the correct fuel tank capacity.
  • J
    Jennifer BlackAug 30, 2025
    What to do if Yamaha 20DMHO Outboard Motor gauge shows “----”?
    • K
      Kayla GutierrezAug 30, 2025
      If the gauge displays '----', it indicates that the digital signal is not being received. Check that the couplers are securely connected and replace any damaged bus wires or hubs.
  • M
    Mark FisherSep 1, 2025
    Why Yamaha Outboard Motor Speedometer or Comb. Speedometer & Fuel mgt gauge shows incorrect fuel level?
    • K
      Kari DeanSep 1, 2025
      If the speedometer or combination speedometer & fuel management gauge shows an incorrect fuel level, the fuel sensor selection is likely wrong. Set up the fuel sensor to the correct resistance.
  • C
    Christopher MilesSep 3, 2025
    How to fix Yamaha Outboard Motor trim gauge showing incorrect position?
    • J
      Joseph ColemanSep 4, 2025
      If the trim gauge shows an incorrect position, the initial position setting might be wrong, or the trim sender could be damaged. Put the motor in the fully trimmed-in position and reset the initial (zero) trim angle. If that doesn't work, replace the trim sender.
  • L
    Lisa KellySep 5, 2025
    Why Yamaha 20DMHO Outboard Motor gauge operates unstably?
    • T
      tracy97Sep 6, 2025
      If the gauge operates unstably, it could be because a resistor is not connected to the ending hubs. Connect the gray 6-pin cap to the ending multi-hubs.
  • B
    Bridget NelsonSep 8, 2025
    What causes Yamaha 20DMHO gauge response to be poor or down?
    • M
      Melissa BeckerSep 8, 2025
      If the gauge response is poor or down, a market obtainable unit connected to the system may have failed, or the signal volume has exceeded 50% of the capacity. Try replacing the unit or removing the heavy signal output unit.

Summary

Installation

Uncrating Procedure (For Typical Steel Frame)

Step-by-step guide for safely removing the outboard motor from its shipping frame.

Mounting the Outboard Motor

Details on proper placement and securing of the outboard motor to the boat transom.

Mounting the Remote Oil Tank

Instructions for installing the remote oil tank for V4 and V6 oil injection engines.

Remote Controls

Tiller Handles

6 X4 Multi-Function Tiller Handle

Describes Yamaha's multi-function tiller handle kits for various engine models.

Conventional Gauge (6 Y5 & 6 Y7)

Analog Tachometer

Information on analog tachometers, their function, and application.

Digital Tachometer

Details on digital tachometers, including their functions and applicable models.

Speedometer

Explanation of speedometer function, variables affecting accuracy, and digital features.

Fuel Management Gauge

Overview of the fuel management gauge functions, applications, and kit contents.

Analog Trim Meter

Information on the analog trim meter, its function, applications, and sender adjustment.

Coolant Pressure Meter

Details on the coolant pressure meter, its function, applications, and sender installation.

Coolant Temp. Meter

Information on the coolant temperature meter, its function, applications, and sender installation.

Hour Meter

Details on hour meters, their function, applications, and wiring.

Voltage Meter

Information on voltage meters, their function, applications, and wiring.

Fuel Meter

Details on fuel meters, their function, applications, and wiring.

Charge Warning Unit

Information on the charge warning unit, its function, applications, and wiring.

Digital Network Gauge (6 Y8)

Wiring Diagrams

Wiring diagrams for single, twin, and triple engine digital network gauge installations.

Troubleshooting

Common troubleshooting steps for issues with digital network gauges and systems.

Battery

Recommended Battery

Provides guidance on selecting the correct battery type and capacity for Yamaha outboard motors.

Battery Wiring

Instructions for battery wiring, including isolator-equipped models and multi-engine setups.

Yamaha 20DMHO Specifications

General IconGeneral
Engine Type2-Stroke
Fuel Delivery SystemCarburetor
Starting SystemManual
Max Power Output20 hp
Gear Ratio2.08:1
SteeringTiller

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