Yamaha F80B - Service Manual

Other manuals for Yamaha F80B

Owner's Manual100 pages

Ower's Manual116 pages

Questions and Answers

S
smithericaAug 20, 2025
How to fix a Yamaha F80B Outboard Motor when the starter won't operate?
- C
  Chad LindseyAug 20, 2025
  If your Yamaha Outboard Motor's starter won't operate, here's what to check: * Ensure the engine stop switch lanyard is attached. * Make sure the shift lever is in neutral. * Check the battery condition; a weak or low battery can be the culprit. Use a battery with the recommended capacity. * Inspect battery connections for looseness or corrosion; tighten cables and clean terminals if needed. * Examine the fuse for the electric start circuit; if blown, check for the cause of the overload, repair, and replace the fuse with the correct amperage. * If none of these steps work, the starter components may be faulty, and you should have it serviced by a Yamaha dealer.
S
Scott LiuOct 31, 2025
What to do if Yamaha Outboard Motor engine will not start but the starter operates?
- I
  Ian PorterOct 31, 2025
  If your Yamaha Outboard Motor engine won't start but the starter operates, consider the following potential causes: 1. The fuel tank may be empty. Refill it with clean, fresh fuel. 2. The fuel might be contaminated or stale. Replace it with clean, fresh fuel. 3. The fuel filter could be clogged. Clean or replace the filter. 4. The spark plugs may be fouled or of the incorrect type. Inspect, clean, or replace them with the recommended type. 5. The spark plug caps might be fitted incorrectly. Check and refit them. 6. There may be poor connections or damaged ignition wiring. Check wires for wear or breaks, tighten loose connections, and replace worn or broken wires. 7. Ensure the engine stop switch lanyard is attached and the shift lever is in neutral. If these steps don't resolve the...
K
Krystal AcostaNov 9, 2025
Why does my Yamaha F80B Outboard Motor engine idle irregularly or stall?
- K
  Kelly GloverNov 10, 2025
  If your Yamaha Outboard Motor engine idles irregularly or stalls, here's what might be happening: * The spark plugs could be fouled or of the incorrect type. Inspect, clean, or replace them with the recommended type. * There might be an obstruction in the fuel system, such as a pinched or kinked fuel line. Check for and clear any obstructions. * The fuel could be contaminated or stale. Replace it with clean, fresh fuel. * The fuel filter may be clogged. Clean or replace it. * Poor connections or damaged ignition wiring can cause issues. Check the wires for wear or breaks, tighten any loose connections, and replace worn or broken wires. * The air vent screw on the fuel tank may be closed. Open the air vent screw. * The choke knob may be pulled out. Return it to the home posit...

Summary

General Information

Safety While Working

Details safety procedures for fire prevention, ventilation, self-protection, and working practices.

Predelivery Checks

Details essential checks for the fuel system, engine oil, battery, and other components.

Specifications

Tightening Torques

Specifies tightening torques for fuel system, power unit, lower unit, and bracket unit components.

Periodic Checks and Adjustments

Maintenance Interval Chart

Lower Unit Checks

Power Unit

Power Unit Checks

Timing Belt and Sprockets

Cylinder Head Service

Covers removal, inspection, and installation of cylinder head components like valves and camshafts.

Cylinder Block Service

Details disassembly and inspection of cylinder bore, pistons, rings, crankshaft, and bearings.

Lower Unit

Lower Unit Removal and Disassembly

Drive Shaft and Lower Case Assembly

Shimming and Backlash Adjustment

Explains procedures for selecting and installing shims for pinion and forward gear backlash.

Bracket Unit

Power Trim and Tilt System

Covers removal, disassembly, checking, and assembly of the power trim and tilt unit and motor.

Gear Pump Service

Tilt Cylinder and Trim Cylinder Service

Electrical Systems

Checking Electrical Components

Ignition and Ignition Control System

Details checks for spark, wires, coils, ECM, pulser coils, sensors, and switches.

Fuel Control System Checks

Starting System Checks

Charging System Checks

Troubleshooting

Yamaha Diagnostic System

Provides an overview of the diagnostic system features, functions, and hardware requirements.

Power Unit Troubleshooting

Guides on diagnosing and resolving issues with the engine not cranking or starting.

Bracket Unit Troubleshooting

Provides troubleshooting steps for power trim and tilt unit operation and shift mechanism issues.

Electrical System Troubleshooting

Guides on diagnosing electrical issues such as weak batteries or charging system faults.

Yamaha F80B Specifications

General

Engine Type	4-Stroke
Power Output	80 HP
Cylinder Configuration	In-line 4
Starting System	Electric
Gear Ratio	2.15:1
Full Throttle RPM Range	5000-6000 RPM
Displacement	1832 cc
Fuel Induction System	EFI (Electronic Fuel Injection)
Ignition System	TCI
Alternator Output	35A
Propeller Shaft Length	20" (L), 25" (XL)
Recommended Fuel	Regular unleaded gasoline
Steering	Remote
Bore x Stroke	81.0 mm x 88.9 mm (3.19 in x 3.50 in)