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Yamaha 8CMH - User Manual

Yamaha 8CMH
329 pages
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90894-62983-01Worldwide Edition
RIGGING GUIDE
2014

Table of Contents

Questions and Answers

  • M
    mcleancynthiaSep 23, 2025
    Why doesn't my Yamaha 8CMH boat speed gauge show?
    • E
      Erica RichardsonSep 23, 2025
      If the boat speed and/or coolant pressure gauge isn't showing, it means the optional sensor hasn't been installed. Install the optional sensor to fix this.
  • J
    James MontesAug 25, 2025
    What to do if the Yamaha 8CMH gauge display does not wake up?
    • T
      Timothy WhitneyAug 25, 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.
  • S
    Shelly BallardAug 25, 2025
    Why Yamaha Outboard Motor illumination does not light?
    • M
      Matthew WrightAug 26, 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.
  • B
    Brittany WhiteAug 27, 2025
    How to fix Yamaha 8CMH Outboard Motor tachometer showing incorrect engine RPM?
    • M
      Molly ThomasAug 27, 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.
  • B
    Betty PerezAug 27, 2025
    What causes Yamaha 8CMH fuel management gauge to show incorrect remaining fuel?
    • K
      Karen MorganAug 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.
  • A
    Alex PhillipsSep 14, 2025
    Why does my Yamaha 8CMH Outboard Motor fuel management gauge show incorrect remaining fuel?
    • D
      David KingSep 14, 2025
      If the fuel management gauge shows incorrect remaining fuel, the fuel capacity setting is probably wrong. Fill the tank with fuel, and then set the correct fuel tank capacity.
  • I
    Ian TaylorSep 12, 2025
    What to do if my Yamaha Outboard Motor speedometer shows the incorrect fuel level?
    • Z
      Zachary WilsonSep 12, 2025
      If the speedometer shows an incorrect fuel level, the fuel sensor selection is likely wrong. You should set up the fuel sensor to the correct resistance.
  • S
    spenceranthonySep 13, 2025
    What does it mean when my Yamaha Outboard Motor gauge shows “----”?
    • Z
      Zachary DiazSep 13, 2025
      If the gauge shows “----”, it indicates that the digital signal is not being received. Make sure the couplers are securely connected and replace any damaged bus wires or hubs.
  • J
    jvillanuevaSep 4, 2025
    Why Yamaha 8CMH boat speed and/or coolant pressure gauge does not show?
    • S
      swansoncristinaSep 5, 2025
      If the boat speed and/or coolant pressure gauge does not show, it is likely that the optional sensor has not been installed. Install the optional sensor.
  • G
    George MarshallSep 2, 2025
    What causes Yamaha 8CMH Outboard Motor gauge response to be poor or down?
    • A
      Amber DonovanSep 2, 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 steel crate.

Mounting the Outboard Motor

Details on the correct positioning and mounting of the outboard motor on a boat transom.

Propellers

Propeller Specifications

Overview of Yamaha propeller types, their design, and features for optimal performance.

Remote Controls

Remote Control Types and Applications

Describes available throttle control systems (Push To Open/Pull To Open) and connector types.

Tiller Handles

6 X4 Multi-Function Tiller Handle

Details the features and electrical functions of the multi-function tiller handle.

Conventional Gauge (6 Y5 & 6 Y7)

Mounting the Meters

Procedures for installing gauges, including selecting mounting locations and connecting wiring.

Fuel Management Gauge

Functions, types, applications, dimensions, and setup procedures for the fuel management gauge.

Digital Network Gauge (6 Y8)

Troubleshooting

Common issues and solutions for system or gauge malfunctions, setup errors, or incorrect operations.

Digital Network Premium Gauge (6 Y9)

Network Wiring Diagrams

Wiring diagrams for dual station applications with 6Y9 gauges and various engine configurations.

Battery

Recommended Battery

Guidelines for selecting the correct battery capacity and CCA rating for engine performance.

Battery Wiring

Instructions for wiring batteries, including isolator-equipped models and twin-engine applications.

Yamaha 8CMH Specifications

General IconGeneral
Engine Type2-Stroke
Max. Output5.9 kW (8 hp)
Fuel Induction SystemCarburetor
Ignition SystemCDI
Starting SystemManual
Gear Ratio2.08 (27/13)
Gear ShiftF-N-R
Fuel Tank Capacity12 L (3.2 US gal)
Lubrication SystemPremix (oil mixed with fuel)

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