Yamaha F115 Owners Manual

							 
Operation 
55
NOTE:
 
For cooling system flushing instructions, see 
page 57. 
Cruising in turbid water 
Yamaha strongly recommends that you use
the optional chromium-plated water pump kit
(not available for some models) if you use
the outboard motor in turbid or muddy water
conditions. 
						

							 
56 
Maintenance 
EMU31480 
Specifications
NOTE:
 
“(AL)” stated in the specification data below
represents the numerical value for the alumi-
num propeller installed.
Likewise, “(SUS)” represents the value for
stainless steel propeller installed and “(PL)” 
for plastic propeller installed. 
EMU28218 
Dimension: 
Overall length: 
825 mm (32.5 in)
Overall width: 
498 mm (19.6 in)
Overall height L: 
F115TR 1609 mm (63.3 in)
Overall height X: 
1736 mm (68.3 in)
Transom height L: 
F115TR 516 mm (20.3 in)
Transom height X: 
643 mm (25.3 in)
Weight (without propeller) L: 
F115TR 183.0 kg (403 lb)
Weight (without propeller) X: 
188.0 kg (414 lb) 
Performance: 
Full throttle operating range: 
5000–6000 r/min
Maximum output: 
84.6 kW@5500 r/min (115 HP@5500 
r/min)
Idling speed (in neutral): 
750  
± 
50 r/min 
Engine: 
Type: 
4-stroke L
Displacement: 
1741.0 cm 
3
 
 (106.24 cu.in)Bore  
× 
 stroke: 
79.0  
× 
 88.8 mm (3.11  
×  
 3.50 in)
Ignition system: 
TCI
Spark plug (NGK): 
LFR6A-11
Spark plug gap: 
1.0–1.1 mm (0.039–0.043 in)
Control system: 
Remote control
Starting system: 
Electric
Starting carburetion system: 
Electronic fuel injection
Valve clearance (cold engine) IN: 
0.17–0.23 mm (0.0067–0.0091 in)
Valve clearance (cold engine) EX: 
0.31–0.37 mm (0.0122–0.0146 in)
Min. cold cranking amps (CCA/SAE): 
380.0 A
Min. marine cranking amps (MCA/ABYC): 
502.0 A
Min. reserve capacity (RC/SAE): 
124 minutes
Alternator output for battery DC: 
25.0 A 
Drive unit: 
Gear positions: 
Forward-neutral-reverse
Gear ratio: 
2.15 (28/13)
Trim and tilt system: 
Power trim and tilt
Propeller mark: 
F115TR K
LF115TR KL 
Fuel and oil: 
Recommended fuel: 
Regular unleaded gasoline
Min. pump octane: 
86 
						

							 
Maintenance 
57 
Recommended engine oil: 
4-stroke outboard motor oil
Engine oil grade API: 
API SE, SF, SG, SH, SJ, SL
Engine oil type SAE: 
SAE10W30 or SAE10W40
Lubrication: 
Wet sump
Engine oil quantity (excluding oil filter): 
4.3 L (4.55 US qt) (3.78 Imp.qt)
Recommended gear oil: 
Hypoid gear oil SAE#90
Gear oil quantity: 
F115TR 760.0 cm 
3
 
 (25.70 US oz) 
(26.81 Imp.oz)
LF115TR 715.0 cm 
3
 
 (24.17 US oz) 
(25.22 Imp.oz) 
Tightening torque for engine: 
Spark plug: 
25.0 Nm (18.4 ft-lb) (2.55 kgf-m)
Propeller nut: 
55.0 Nm (40.6 ft-lb) (5.61 kgf-m)
Engine oil drain bolt: 
28.0 Nm (20.7 ft-lb) (2.86 kgf-m)
Engine oil filter: 
18.0 Nm (13.3 ft-lb) (1.84 kgf-m) 
EMU28222 
Transporting and storing 
outboard motor
WARNING
 
EWM00690  
 
Leaking fuel is a fire hazard. When
transporting and storing the outboard
motor, close the air vent screw and fuel
cock to prevent fuel from leaking. 
 
USE CARE when transporting fuel tank,
whether in a boat or car. 
 
DO NOT fill fuel container to maximum
capacity. Gasoline will expand consid-
erably as it warms up and can build up
pressure in the fuel container. This cancause fuel leakage and a potential fire 
hazard.
WARNING
 
EWM00700  
Never get under the lower unit while it is
tilted, even if a motor support bar is used.
Severe injury could occur if the outboard 
motor accidentally falls.
CAUTION:
 
ECM00660  
Do not use the tilt support lever or knob
when trailering the boat. The outboard
motor could shake loose from the tilt sup-
port and fall. If the motor cannot be trail-
ered in the normal running position, use
an additional support device to secure it 
in the tilt position. 
The outboard motor should be trailered and
stored in the normal running position. If there
is insufficient road clearance in this position,
then trailer the outboard motor in the tilt po-
sition using a motor support device such as
a transom saver bar. Consult your Yamaha
dealer for further details. 
EMU28280 
Storing outboard motor 
When storing your Yamaha outboard motor
for prolonged periods of time (2 months or
longer), several important procedures must
be performed to prevent excessive damage.
ZMU03659 
						

							 
Maintenance 
58 
It is advisable to have your outboard motor
serviced by an authorized Yamaha dealer
prior to storage. However, you, the owner,
with a minimum of tools, can perform the fol-
lowing procedures.
CAUTION:
 
ECM01080  
 
To prevent problems which can be
caused by oil entering the cylinder from
the sump, keep the outboard motor in
the attitude shown when transporting
and storing it. If storing or transporting
the outboard motor on its side (not up-
right), put it on a cushion after draining
the engine oil. 
 
Do not place the outboard motor on its
side before the cooling water has
drained from it completely, otherwise
water may enter the cylinder through
the exhaust port and cause engine trou-
ble. 
 
Store the outboard motor in a dry, well- 
ventilated place, not in direct sunlight. 
EMU28303 
Procedure 
EMU28380 
Flushing with the flushing attachment 
1. Wash the outboard motor body using
fresh water. For further information, see
page 61.
2. Fill the fuel tank with fresh fuel and add
one ounce of “Yamaha Fuel Conditioner
and Stabilizer” (Part No. LUB-FUELC-
12-00) to each gallon of fuel.
NOTE:
 
The use of “Yamaha Fuel Conditioner and
Stabilizer” eliminates the need to drain the
fuel system. Consult your Yamaha dealer or
other qualified mechanic if the fuel system is 
to be drained instead.
3. Remove the top cowling and silencercover/cap. Remove the propeller.
4. Install the flushing attachment over the
cooling water inlet.
CAUTION:
 
ECM00300  
Do not run the engine without supplying
it with cooling water. Either the engine
water pump will be damaged or the en-
gine will be damaged from overheating.
Before starting the engine, be sure to
supply water to the cooling water passag- 
es.
CAUTION:
 
ECM00310  
Avoid running the outboard motor at high
speed while on the flushing attachment, 
otherwise overheating could occur. 
5. Cooling system flushing is essential to
prevent the cooling system from clog-
ging up with salt, sand, or dirt. In addi-
tion, fogging/lubricating of the engine is
mandatory to prevent excessive engine
damage due to rust. Perform the flush-
ing and fogging at the same time.
WARNING
 
EWM00090  
 
Do not touch or remove electrical parts 
1. Flushing attachment 
						

							 
Maintenance 
59 
when starting or during operation. 
 
Keep hands, hair, and clothes away
from the flywheel and other rotating 
parts while the engine is running. 
6. Run the engine at a fast idle for 10–15
minutes in neutral position while supply-
ing fresh water.
7. Just prior to turning off the engine, quick-
ly spray “Yamaha Stor-Rite Engine
Fogging Oil” (Part No. LUB-STRRT-12-
00) alternately into each carburetor/
each intake manifold. When properly
done, the engine will smoke excessively
and almost stall.
8. Remove the flushing attachment and
wipe off any excess water.
9. Install the silencer cover/cap and top
cowling. Install the propeller.
NOTE:
 
A flushing attachment is available from your 
Yamaha dealer. 
EMU28401 
Lubrication 
1. Grease the spark plug threads and in-
stall the spark plug(s) and torque to
proper specification. For information on
spark plug installation, see page 64.
2. Change the gear oil. For instructions,
see page 71. Inspect the oil for the pres-
ence of water that indicates a leaky seal.
Seal replacement should be performed
by an authorized Yamaha dealer prior to
use.
3. Grease all grease fittings. For further de-
tails, see page 64. 
EMU30261 
Cleaning and anticorrosion 
measures 
1. Wash down the exterior of the outboard
motor with fresh water and dry off com-pletely.
2. Spray the outboard motor exterior with
“Yamaha Silicone Protectant” (Part No.
LUB-SILCNE-13-00).
CAUTION:
 
ECM01401  
Do not spray when the engine is running.
Also, do not spray near the silencer or
into the engine. Otherwise the engine 
could be damaged. 
3. Wax the cowling with a non-abrasive
wax such as “Yamaha Silicone Wax”
(Part No. ACC-11000-15-02). 
EMU28430 
Battery care
WARNING
 
EWM00330  
Battery electrolytic fluid is dangerous; it
contains sulfuric acid and therefore is
poisonous and highly caustic.
Always follow these preventive mea-
sures: 
 
Avoid bodily contact with electrolytic
fluid as it can cause severe burns or
permanent eye injury. 
 
Wear protective eye gear when han-
dling or working near batteries.
Antidote (EXTERNAL): 
 
SKIN - Flush with water. 
 
EYES - Flush with water for 15 minutes
and get immediate medical attention.
Antidote (INTERNAL): 
 
Drink large quantities of water or milk
followed by milk of magnesia, beaten
egg, or vegetable oil. Get immediate
medical attention.
Batteries also generate explosive hydro-
gen gas; therefore, you should always
follow these preventive measures: 
 
Charge batteries in a well-ventilated ar- 
						

							 
Maintenance 
60 
ea. 
 
Keep batteries away from fire, sparks,
or open flames (for example: welding
equipment, lighted cigarettes, and so
on.) 
 
DO NOT SMOKE when charging or han-
dling batteries.
KEEP BATTERIES AND ELECTROLYTIC 
FLUID OUT OF REACH OF CHILDREN. 
Batteries vary among manufacturers. There-
fore the following procedures may not al-
ways apply. Consult your battery
manufacturer’s instructions.
Procedure
1. Disconnect and remove the battery from
the boat. Always disconnect the black
negative cable first to prevent the risk of
shorting.
2. Clean the battery casing and terminals.
Fill each cell to the upper level with dis-
tilled water.
3. Store the battery on a level surface in a
cool, dry, well-ventilated place out of di-
rect sunlight.
4. Once a month, check the specific gravity
of the electrolyte and recharge as re-
quired to prolong battery life.
 
EMU28442 
Flushing power unit 
Perform this procedure right after operation
for the most thorough flushing.
CAUTION:
 
ECM01530  
Do not perform this procedure while the
engine is running. The water pump may
be damaged and severe damage from 
overheating can result. 
1. After shutting off the engine, unscrew
the garden hose connector from the fit-
ting on the bottom cowling.2. Screw the garden hose adapter onto a
garden hose, which is connected to a
fresh water supply, and then connect it
to the garden hose connector.
3. With the engine off, turn on the water tap
and let the water flush through the cool-
ing passages for about 15 minutes. Turn
off the water and disconnect the garden
hose adapter from the garden hose con-
nector.
4. Reinstall the garden hose connector
onto the fitting on the bottom cowling.
Tighten the connector securely.
CAUTION:
 
ECM00540  
Do not leave the garden hose connector
loose on the bottom cowling fitting or let
the hose hang free during normal opera- 
1. Fitting
2. Garden hose connector
3. Garden hose adapter
1
2 3
ZMU04264 
						

							 
Maintenance 
61 
tion. Water will leak out of the connector
instead of cooling the engine, which can
cause serious overheating. Be sure the
connector is tightened securely on the fit- 
ting after flushing the engine.
NOTE:
 
 
When flushing the engine with the boat in
the water, tilting up the outboard motor un-
til it is completely out of the water will
achieve better results. 
 
For cooling system flushing instructions, 
see page 57. 
EMU28450 
Cleaning the outboard motor 
After use, wash the exterior of the outboard
motor with fresh water. Flush the cooling
system with fresh water.
NOTE:
 
For cooling system flushing instructions, see 
page 57. 
EMU28460 
Checking painted surface of motor 
Check the motor for scratches, nicks, or flak-
ing paint. Areas with damaged paint are
more likely to corrode. If necessary, clean
and paint the areas. A touch-up paint is avail-
able from your Yamaha dealer. 
EMU28486 
Periodic maintenance
WARNING
 
EWM01070  
Be sure to turn off the engine when you
perform maintenance unless otherwise
specified. If you or the owner is not famil-
iar with machine servicing, this work
should be done by your Yamaha dealer or 
other qualified mechanic.
Maintenance, replacement, or repair of
the emission control devices and sys-
tems may be performed by any marine
engine repair establishment or individual.
All warranty repairs, however, including
those to the emission control system,
must be performed by an authorized
Yamaha marine dealership. 
A service manual is available for purchase
through your Yamaha dealer for owners who
have the mechanical skills, tools, and other
equipment necessary to perform mainte-
nance not covered by this owner’s manual. 
EMU28510 
Replacement parts 
If replacement parts are necessary, use only
genuine Yamaha parts or parts of the same
type and of equivalent strength and materi-
als. Any part of inferior quality may malfunc-
tion, and the resulting loss of control could
endanger the operator and passengers.
Yamaha genuine parts and accessories are
available from your Yamaha dealer.
ZMU04265 
						

							 
Maintenance 
62 
EMU30563 
Maintenance chart
NOTE:
 
 
Refer to the sections in this chapter for explanations of each owner-specific action. 
 
The maintenance cycle on these charts assume usage of 200 hours per year and regular
flushing of the cooling water passages. Maintenance frequency should be adjusted when
operating the engine under adverse conditions such as extended trolling. 
 
Disassembly or repairs may be necessary depending on the outcome of maintenance
checks. 
 
Expendable or consumable parts and lubricants will lose their effectiveness over time and
through normal usage regardless of the warranty period. 
 
When operating in salt water, turbid or muddy water, the engine should be flushed with 
clean water after each use.
The “” symbol indicates the check-ups which you may carry out yourself.
The “” symbol indicates work to be carried out by your Yamaha dealer. 
Item ActionsInitial Every
10 hours 
(1 month)50 hours 
(3 
months)100 
hours (6 
months)200 
hours (1 
year)  
Anode(s) (external)Inspection / replace-
ment
Anode(s) (cylinder 
head, thermostat 
cover)Inspection / replace-
ment
Battery Inspection / charging
Cooling water pas-
sagesCleaning
Cowling clamp Inspection
Fuel filter (can be dis-
assembled)Inspection / replace-
ment
Fuel system Inspection
Gear oil Change
Greasing points Greasing
Idling speed Inspection
PCV (Pressure Con-
trol Valve)Inspection
Power trim and tilt unit Inspection
Propeller and cotter pinInspection / replace-
ment
Shift link / shift cable Inspection / adjustment 
						

							 
Maintenance 
63 
EMU28874 
Maintenance chart (additional) 
EMU28910
NOTE:
 
When using lead or high-sulfur gasoline, inspecting valve clearance may be required more 
frequently than every 500 hours. 
ThermostatInspection / replace-
ment
Throttle link / throttle 
cable / throttle pick-up 
timingInspection / adjustment
Water pumpInspection / replace-
ment
Engine oil Inspection / change
Oil filter (cartridge) Change
Spark plug(s)Cleaning / adjustment / 
replacement
Timing beltInspection / replace-
ment 
Item ActionsEvery
500 hours (2.5 years) 1000 hours (5 years) 
Timing belt Replacement
Valve clearance 
(DOHC)Inspection / adjustment
Fuel filter (vapor sepa-
rator tank)Replacement
Anode(s) (exhaust 
cover, cover joint)Replacement
Exhaust guide, exhaust 
manifoldInspection / replace-
ment 
Item ActionsInitial Every
10 hours 
(1 month)50 hours 
(3 
months)100 
hours (6 
months)200 
hours (1 
year) 
						

							 
Maintenance 
64 
EMU28931 
Greasing 
Yamaha marine grease (Water resistant grease) 
F115, LF115 
EMU28952 
Cleaning and adjusting spark plug
WARNING
 
EWM00560  
When removing or installing a spark plug,
be careful not to damage the insulator. A
damaged insulator could allow external
sparks, which could lead to explosion or 
fire. 
The spark plug is an important engine com-
ponent and is easy to inspect. The condition
of the spark plug can indicate something
about the condition of the engine. For exam-
ple, if the center electrode porcelain is very
white, this could indicate an intake air leak or
carburetion problem in that cylinder. Do notattempt to diagnose any problems yourself.
Instead, take the outboard motor to a
Yamaha dealer. You should periodically re-
move and inspect the spark plug because
heat and deposits will cause the spark plug
to slowly break down and erode. If electrode
erosion becomes excessive, or if carbon and
other deposits are excessive, you should re-
place the spark plug with another of the cor-
rect type.
Before fitting the spark plug, measure the
electrode gap with a wire thickness gauge;
adjust the gap to specification if necessary.
ZMU04266
 
Standard spark plug:
LFR6A-11