Yamaha F60AET Specifications
| Engine Model: Yamaha F60AET |
| Engine Type: 4-stroke inline 4-cylinder OHC 8-valve gasoline outboard engine |
| Total Displacement: 60.8 cu.in (996 cc) |
| Rated Engine Power: 60 Hp (44.1 kW) at 5500 rpm |
| Fuel System: Carburetors |
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The Yamaha F60AET is a 60-horsepower,
four-stroke outboard engine renowned for its lightweight construction,
fuel efficiency, and quiet operation, representing a refined balance of
power and reliability within Yamaha's midrange lineup.
This model is distinguished by its 996cc, inline four-cylinder powerhead
featuring an Overhead Camshaft (OHC) design, electric start system,
remote control steering, and power trim and tilt, providing operators
with effortless command and the ability to precisely adjust the boat's
attitude for optimal handling and fuel economy.
The F60AET is engineered for versatility and durability, making it
exceptionally well-suited for a wide variety of recreational and
semi-commercial applications, from aluminum fishing boats and utility
skiffs to small center consoles and as auxiliary power for larger
sailing vessels. Its four-stroke design ensures cleaner operation with
reduced emissions and noise, while features like the Prime Start system
and corrosion-resistant engineering enhance user convenience and
longevity in demanding marine environments.
The Yamaha F60AET is a 4-stroke, Overhead Camshaft (OHC), inline
4-cylinder engine. The total displacement is 996 cc (60.78 cu.in),
achieved through a bore and stroke of 65.0 mm (2.56 inches) and 75.0 mm
(2.95 inches), respectively. It produces a maximum prop shaft output of
44.1 kW, equivalent to 60 horsepower, at 5,500 rpm. The engine has a
full throttle operating range of 5,000 to 6,000 rpm. The idle speed in
neutral is set at 850 rpm, with a tolerance of ±50 rpm. The compression
ratio is 9.3:1.
The powerhead is built upon a robust cylinder block designed for
longevity and smooth operation. The cylinder head incorporates an
Overhead Camshaft (OHC) design. The valve clearances are critical for
performance and must be maintained within specified ranges with the
engine cold. The intake valve clearance is set to 0.15-0.25 mm
(0.0059-0.0098 inches), while the exhaust valve clearance is set to
0.25-0.35 mm (0.0098-0.0138 inches).
The ignition control system is a microcomputer-controlled Capacitor
Discharge Ignition (CDI) system, with ignition timing ranging from 5
degrees Before Top Dead Center (BTDC) at idle to 35 degrees BTDC at
wide-open throttle.
The fuel system is based on four individual carburetors, one for each
cylinder, featuring Yamaha's Prime Start enrichment system for
effortless starting in various conditions. The engine operates on
regular unleaded gasoline with a minimum octane rating of 90 (R.O.N.).
A standard remote fuel tank has a capacity of 25.0 liters (6.60 US
gallons, 5.50 Imperial gallons). The fuel system should be inspected
periodically for leaks, damage, or wear, with the fuel filter cleaned at
least once every 200 hours of operation.
The F60AET utilizes a wet sump lubrication system, meaning engine oil is
contained within a sump in the powerhead. The recommended engine oil is
high-quality 4-stroke motor oil with SAE viscosities of 10W-30, 10W-40,
or 20W-40 that meet API service classifications SE, SF, SG, SH, or SL.
The total engine oil capacity, including the oil filter, is 2.2 liters
(2.3 US quarts, 1.9 Imperial quarts). Oil changes should be performed
regularly, approximately every 100 hours of operation or annually, to
maintain proper lubrication and prevent engine wear.
Cooling is managed by a raw-water system circulating water through
passages in the engine block and cylinder head. A water pump, driven by
the drive shaft, draws water from outside the boat and forces it through
the engine to maintain optimal operating temperatures. The system
includes a thermostat that regulates water flow, allowing the engine to
warm up quickly and maintain a consistent temperature.
The cooling system should be inspected every 100 hours of operation,
including the water pump, thermostat, and cooling passages, with the
system flushed with fresh water after each use in saltwater environments
to prevent corrosion and maintain cooling efficiency. A pilot water
outlet on the engine exterior provides a visual indication that the
water pump is functioning and cooling water is circulating properly.
| Mid Section and Lower Unit |
The exhaust system is designed to expel gases through the propeller boss
for quieter operation and reduced back pressure. The gear shift
positions are forward, neutral, and reverse. The gear ratio is 1.85:1,
derived from a 24/13 gear set. The reduction gear type is spiral bevel
gear, and the clutch is a dog type, providing positive engagement.
The propeller shaft utilizes a spline drive system with propeller mark G
for secure propeller mounting. The gear case requires hypoid gear oil
meeting API GL-4 SAE 90 standards, with a total capacity of 0.47 liters
(0.49 US quarts). The lower unit should be inspected every 200 hours of
operation, with gear oil changed and moving parts lubricated to maintain
optimal condition.
The engine is equipped with a power trim and tilt system, providing
full, relaxed control over the engine's angle relative to the transom.
The trim angle is adjustable, allowing operators to optimize boat
attitude for acceleration, fuel economy, and ride comfort under varying
load and water conditions. The tilt function enables shallow water
operation and easy trailering or beaching.
Selecting the correct propeller is essential for achieving optimal
engine performance within the recommended full throttle operating range.
The Yamaha F60AET utilizes a spline drive system with propeller mark G
and is designed to run with a wide selection of aluminum and stainless
steel propellers.
Available propeller sizes, listed by diameter and pitch in inches,
include aluminum options such as 10-3/4 x 16, 10-3/4 x 17, and 11-1/4 x
14. Stainless steel options include 10-1/4 x 15, 10-1/4 x 16, 11-1/4 x
14, 11-1/2 x 13, 11-3/4 x 12, and 12 x 11. The appropriate propeller
allows the engine to operate at or near the top of its 5,000-6,000 rpm
full throttle range when the boat is properly loaded.
The overall length of the outboard is 706 mm (27.8 inches). The overall
width is 384 mm (15.1 inches). The overall height for the long shaft
model, designated for a 20-inch transom, is 1,415 mm (55.7 inches), with
a corresponding transom height of 527 mm (20.7 inches).
An extra-long shaft version (F60AETX) is available with an overall
height of 1,511 mm (59.5 inches) and transom height of 635 mm (25.0
inches). The dry weight for the long shaft version is 114 kg (251 lbs).
Routine maintenance is essential for optimal performance and longevity.
The engine is equipped with a microcomputer CDI ignition control system.
The alternator output is 12 volts at 10 amperes, providing battery
charging capability. The recommended battery specification includes
minimum cold cranking A of 430 A (CCA/EN) and minimum rated capacity of
70.0 Ah (20HR/IEC).
The standard spark plug for the F60AET is an NGK DPR5EA-9. The spark
plug gap must be maintained between 0.8 and 0.9 mm (0.031-0.035 inches).
Spark plugs should be inspected every 100 hours of operation and
replaced if signs of wear or damage are present.
The maintenance schedule includes key services at regular intervals. The
air filter should be inspected every 50 hours of operation or once per
season. The fuel system requires inspection every 100 hours, with the
fuel filter cleaned at least once every 200 hours.
The cooling system requires inspection every 100 hours, including water
pump, thermostat, and cooling passages. The lower unit requires
inspection every 200 hours, with gear oil changed and moving parts
lubricated. A visual inspection of the engine and outboard should be
performed before each use to detect any signs of damage or wear.
For major repairs or maintenance, contacting an authorized Yamaha dealer
or qualified marine mechanic ensures the engine is maintained according
to Yamaha standards. Before winter storage, the fuel system should be
drained and the cooling system flushed with fresh water, with moving
parts lubricated and the engine cleaned thoroughly.
Adhering to correct torque specifications is critical during assembly
and maintenance to ensure proper sealing, component retention, and safe
operation. The spark plug must be torqued to 17 Nm (12.5 lb-ft) to
ensure proper seating without damaging the cylinder head threads. The
propeller nut, which secures the propeller to the propeller shaft,
requires 34 Nm (25 lb-ft).
The engine oil drain plug must be tightened to 27 Nm (20 lb-ft) to
prevent leaks while allowing future removal. The oil filter requires 18
Nm (13.5 lb-ft) for proper sealing against its mounting surface.
Additional torque specifications for critical fasteners are documented
in the official service manual.
The Yamaha F60AET is intended for use on boats where the total
horsepower does not exceed the vessel's maximum rated power capacity, as
indicated on the boat's capacity plate. Its 60-horsepower output makes
it suitable for a wide range of boats, including aluminum fishing boats,
utility skiffs, small center-console vessels, and as auxiliary power for
larger sailboats. The long shaft configuration is specifically designed
for boats with a 20-inch transom, while the extra-long shaft version
accommodates 25-inch transoms.
The engine's lightweight design relative to its power output makes it
particularly attractive for vessels where weight distribution is a
concern. Proper installation, including correct remote control cable
adjustment and battery selection, is essential to ensure safe handling
and prevent loss of control. As with all outboards, operators must
always ensure the engine stop switch lanyard is attached to a secure
part of their clothing or life jacket.
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