Yamaha FT50GET Specifications
| Engine Model: Yamaha FT50GET |
| Engine Type: 4-stroke inline 4-cylinder SOHC 8-valve gasoline outboard engine |
| Total Displacement: 60.8 cu.in (996 cc) |
| Rated Engine Power: 50 Hp (36.8 kW) at 5500 rpm |
| Fuel System: Electronic Fuel Injection (EFI) |
____________________________________________________________________________________
The Yamaha FT50GET is a 50-horsepower,
four-stroke, high-thrust outboard motor from Yamaha's dedicated FT
series. This engine is specifically engineered for displacement hull
vessels where maximum thrust and precise maneuverability are more
critical than outright top speed, making it an ideal choice for
sailboats, commercial fishing boats, and heavy workboats.
The powerplant is a 996 cc, inline four-cylinder, single overhead
camshaft (SOHC) design with eight valves, delivering refined, reliable
power with an emphasis on torque. It features Yamaha's advanced
Electronic Fuel Injection (EFI), which ensures clean, efficient
performance, effortless starting in all conditions, and optimal fuel
metering.
A defining characteristic of the FT50GET is its specially optimized
lower unit gear ratio, providing exceptional forward and reverse thrust
for handling heavier boats, especially in confined spaces. This model,
designated FT50GET, features electric start, power trim and tilt, and is
designed for remote control operation. The engine is also compatible
with the optional YCOP immobiliser system for enhanced security and
includes a variable trolling RPM switch for precise speed control during
slow-speed maneuvers.
Yamaha FT50GET Specifications
Engine type: 4-Stroke, SOHC, In-line 4, 8-Valve
Number of cylinders: 4
Total displacement: 996 cc (60.8 cu in)
Bore and stroke: 65.0 x 75.0 mm (2.56 x 2.95 in)
Power output: 36.8 kW (50 hp) at 5,500 rpm
Full throttle operating range: 5,000-6,000 rpm
Idle speed: 700-800 rpm
Compression ratio: 9.50:1
Fuel system: EFI (Electronic Fuel Injection) with multi-point injection
Ignition system: TCI (Transistor Controlled Ignition)
Starting system: Electric
Control system: Remote control
Alternator output: 12V - 16A with rectifier/regulator
Spark plug: NGK DPR6EB-9
Spark plug gap: 0.8-0.9 mm (0.031-0.035 in)
Cooling system: Water, thermostatically controlled
Exhaust system: Through propeller hub
Lubrication system: Wet sump
Recommended fuel: Regular unleaded gasoline (minimum 86 octane, 90 RON)
Fuel tank capacity: 25.0 L (6.6 US gal)
Engine oil grade: 4-stroke outboard motor oil (Yamalube recommended)
Engine oil type: SAE 10W-30 or 10W-40, API SE, SF, SG, SH, SJ, SL
Engine oil capacity (without filter replacement): 2.5 L (2.6 US qt)
Gear oil type: Hypoid gear oil SAE90
Gear oil grade: API GL-4
Gear oil capacity: 0.67 L (0.70 US qt)
Gear ratio: 2.33 (28/12)
Gear shift positions: Forward - Neutral - Reverse
Reduction gear type: Spiral bevel gear
Clutch type: Dog clutch
Propeller shaft type: Spline
Propeller direction (rear view): Clockwise
Propeller drive system: Spline
Trim and tilt system: Power Trim and Tilt
Shallow water drive: Included
Steering angle: 40 degrees each direction
The Yamaha FT50GET is constructed around a precision-engineered 996 cc
inline four-cylinder powerhead. The cylinder block is made from
high-strength aluminum alloy, providing a lightweight yet rigid
foundation for the internal components. The cylinder bore and stroke are
configured at 65.0 mm and 75.0 mm respectively.
The cylinder head features a single overhead camshaft (SOHC) operating
eight valves via rocker arms, with two intake and two exhaust valves per
cylinder. The powerhead assembly is designed for smooth operation and
long service life, with a focus on delivering high torque at low engine
speeds for superior thrust applications.
The closed-deck cylinder block design ensures structural integrity,
while the pistons are made from high-strength aluminum alloy with
refined skirt designs to reduce friction and noise. The connecting rods
are forged for strength to handle the torque output of this engine.
The SOHC valve train in the FT50GET requires periodic valve clearance
inspection and adjustment to maintain optimal performance and quiet
operation. The intake valve clearance, measured with the engine cold, is
specified at 0.15-0.25 mm (0.006-0.010 in). The exhaust valve clearance,
which operates under higher thermal loads, is set to 0.25-0.35 mm
(0.010-0.014 in).
The camshaft is driven by a timing chain, designed for durability and
minimal maintenance. The valve train components are lubricated by
pressurized oil from the wet sump system. The cylinder head incorporates
a precision-machined sealing surface and requires a new gasket upon any
reassembly. Proper valve adjustment is essential for ensuring complete
combustion, maximum power output, and prevention of valve burning,
particularly in an engine designed for prolonged operation at low speeds
under heavy load.
The FT50GET employs a sophisticated Electronic Fuel Injection (EFI)
system that represents the pinnacle of fuel delivery technology for this
engine class. This system precisely meters fuel to each cylinder through
compact, high-pressure fuel injectors, optimizing the air-fuel mixture
for all operating conditions. The EFI system utilizes a single throttle
body with a single throttle valve, combined with a multi-point injection
system that delivers fuel in groups.
An Electric Control Module (ECM) processes data from multiple sensors,
including throttle position, intake air pressure and temperature, and
cooling water temperature, to calculate the exact fuel requirement in
real-time. The system includes a throttle position sensor with a
learning function that adapts to the engine's characteristics over time.
Cold starts are simplified with automatic enrichment, eliminating the
need for a manual choke.
The fuel system includes a high-pressure electric fuel pump, a fuel
filter with water separator, and a vapor separator to manage fuel
vapors. The engine operates on regular unleaded gasoline with a minimum
octane rating of 86 (PON) or 90 (RON). A 25-liter portable fuel tank is
typically used with this engine. The system is designed for compact
operation at low rpm, ensuring excellent fuel economy and clean
combustion during prolonged trolling or slow-speed maneuvering.
The Yamaha FT50GET utilizes a wet sump lubrication system, where engine
oil is stored in an integrated oil pan at the base of the engine. A
trochoidal oil pump, driven by the crankshaft, circulates oil under
pressure throughout the engine, delivering lubricant to the crankshaft
main bearings, connecting rod bearings, camshaft journals, and valve
train components.
The system includes a full-flow oil filter that removes contaminants
from the oil. An oil pressure sensor monitors system pressure and
triggers a warning if pressure drops below a safe level. The recommended
oil is a high-quality 4-stroke motor oil meeting API SE, SF, SG, SH, SJ,
or SL specifications, with SAE 10W-30 or 10W-40 being suitable for most
operating conditions.
The engine oil capacity without filter replacement is 2.5 liters (2.6 US
quarts). The oil drain plug is torqued to 27 Nm (20 lb-ft), and the oil
filter to 18 Nm (13.5 lb-ft). Regular oil and filter changes are
essential for engine longevity, particularly given the high-torque,
heavy-load applications for which this engine is designed.
The cooling system is a raw-water, thermostatically controlled design. A
high-capacity water pump, driven by the driveshaft, draws water from the
body of water through an inlet in the lower unit. This water is then
circulated through water jackets in the cylinder block and cylinder head
to absorb combustion heat. The system is regulated by a thermostat that
maintains optimal operating temperature by controlling water flow.
The FT50GET features a freshwater flushing device, allowing owners to
easily connect a garden hose to flush the cooling system with fresh
water after operation in salt or polluted water, significantly reducing
corrosion risk. The cooling system includes a cooling water temperature
sensor that monitors engine temperature and communicates with the ECM to
optimize engine operation and trigger overheat protection if necessary.
An overheat warning device activates if the engine exceeds safe
operating temperatures, with an automatic rpm reduction feature to
protect the engine. The cooling water pilot hole provides a visual
indication that the water pump is functioning and water is circulating
through the engine.
| Mid Section and Lower Unit |
The mid section houses the driveshaft and exhaust passage, connecting
the powerhead to the lower unit. The lower unit is specifically
engineered for high-thrust applications. The gear ratio is 2.33:1,
achieved with a pinion gear and forward gear set of 28/12 teeth. This
specially optimized gear ratio is lower than standard outboard ratios,
providing increased torque to the propeller for superior thrust and
acceleration, particularly under heavy load conditions when powering
heavy displacement vessels.
The reduction gears are of the spiral bevel type, selected for their
strength and smooth, quiet operation. The clutch mechanism is a dog
clutch, providing positive engagement for shifting. Gear shift positions
are forward, neutral, and reverse. The propeller shaft is splined to
accept the special high-thrust propellers. The lower unit housing is
constructed from corrosion-resistant materials and incorporates
sacrificial anodes to protect against galvanic corrosion.
The gear housing is filled with hypoid gear oil meeting SAE 90 GL-4
specifications, with a total capacity of 0.67 liters (0.70 US quarts).
The lower unit bolts require a torque of 40 Nm (29 lb-ft). Regular
inspection and periodic changing of the gear oil are necessary to detect
water ingress or wear particles.
The Yamaha FT50GET is equipped with a power trim and tilt system,
allowing effortless adjustment of the engine angle relative to the boat
transom. The system uses an electro-hydraulic pump and dual hydraulic
cylinders to raise and lower the engine.
The trim angle range extends from negative trim positions (trimmed fully
in, forcing the bow down for planing, though planing is not the primary
operational mode for this engine) to positive trim angles for optimal
running attitude at displacement speeds. The system also provides a
tilt-up angle sufficient for beaching, launching, trailering, or shallow
water operation.
A shallow water drive feature is included, allowing the engine to be
tilted up partially for navigating in very shallow water while still
providing propulsion. The power trim and tilt system is controlled by
rocker switches on the remote control. The system should be checked for
smooth operation and abnormal noise during predelivery inspections and
routine maintenance.
Selecting the correct propeller is essential for optimizing the
performance of the Yamaha FT50GET. The engine is designed to operate
within its full throttle rpm range of 5,000-6,000 rpm, and the propeller
pitch must be chosen so that, with a normal boat load, the engine
reaches the upper half of this range at full throttle. The FT50GET
utilizes Yamaha's "K" propeller mark, indicating propellers specifically
designed for high-thrust applications.
These propellers feature larger diameters and lower pitch ranges than
standard propellers to maximize thrust in both forward and reverse
directions. The blade design, combined with the low gear ratio, provides
exceptional reverse thrust, dramatically improving maneuverability when
docking or handling heavy boats in tight quarters. The high-thrust
design also reduces cavitation and propeller slippage under heavy load.
Standard propeller sizes for high-thrust applications differ from
conventional outboards; the exact size should be selected based on boat
type, weight, and application to ensure the engine operates within its
full throttle RPM range. The propeller nut must be tightened to the
specified torque of 34 Nm (25 lb-ft). A new cotter pin must be used each
time the propeller nut is removed and reinstalled.
Overall length: 706 mm (27.8 in)
Overall width: 384 mm (15.1 in)
Overall height (long shaft): 1,455 mm (57.3 in)
Overall height (extra long shaft): 1,569 mm (61.8 in)
Transom height (long shaft): 530 mm (20.9 in)
Transom height (extra long shaft): 644 mm (25.4 in)
Weight (long shaft): 115 kg (254 lb)
Weight (extra long shaft): 119 kg (262 lb)
After first 10 hours or 1 month: Change engine oil and oil filter.
Inspect gear oil for water contamination. Check and retighten all bolts
and nuts. Every 50 hours or 3 months: Inspect and clean spark plugs.
Check and clean fuel filter. Inspect fuel lines and connections for
cracks or damage. Check gear oil level and condition. Lubricate all
control linkages and moving parts.
Every 100 hours or 6 months: Change engine oil and oil filter. Replace
spark plugs. Inspect and clean cooling water passages. Check condition
of sacrificial anodes, replacing if significantly eroded. Check valve
clearance and adjust as necessary.
Every 200 hours or 1 year: Replace water pump impeller. Inspect and
clean entire fuel system, including fuel injectors and vapor separator.
Replace fuel lines if hardened or cracked. Perform a thorough check of
all electrical connections and controls. Change gear oil.
Spark plug: 17 Nm (12.5 lb-ft)
Propeller nut: 34 Nm (25 lb-ft)
Oil drain plug: 27 Nm (20 lb-ft)
Oil filter: 18 Nm (13.5 lb-ft)
The Yamaha FT50GET is specifically designed for vessels that benefit
from high thrust and precise control rather than high speed. It is an
ideal power choice for sailboats, including trailerable yachts such as
the MacGregor 26M, where the high-thrust propeller and robust low-speed
control provide reliable auxiliary power for maneuvering in and out of
marinas. Commercial fishing boats and workboats, which often operate
under heavy loads and require dependable, fuel-efficient power for
extended periods at displacement speeds, are perfectly matched with this
engine.
The FT50GET is also an excellent choice for heavy displacement fishing
vessels, large aluminum skiffs used in commercial applications, and
pontoon boats where maximum thrust for pushing heavy loads is
prioritized over top speed. The variable trolling RPM switch provides
precise speed control for trolling applications, making it valuable for
sport fishing operations where maintaining an exact speed is critical.
The optional YCOP immobiliser system adds an extra layer of security for
boat owners who trailer their vessels or moor in public areas.
____________________________________________________________________________________
| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
