Yamaha F2 5 Service Manual

69M3E113-6
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3. Clean the electrodes 2
 with a spark plug
cleaner or wire brush. Replace the spark
plug if necessary.
4. Check the electrodes for erosion and
excessive carbon or other deposits, and
the gasket for damage. Replace the
spark plug if necessary.
5. Check the spark plug gap a
. Adjust if out
of specification.
6. Install the spark plug, tighten it finger
tight b
, then to the specified torque with
a spark plug wrench c
.
Checking the thermostat
1. Remove the fuel tank 1
, manual...

CHK 
ADJ
Periodic checks and adjustments
3-769M3E11
4. Check the thermostat valve opening at
the specified water temperatures.
Replace if out of specification.
5. Install the thermostat, new gasket, ther-
mostat cover, flywheel magnet cover,
manual starter, and fuel tank.
Checking the cooling water passage
1. Check the cooling water inlet 1
 for
clogs. Clean if necessary.
2. Place the lower unit in water, and then
start the engine.
3. Check for water flow at the cooling water
pilot hole. If there is no...

69M3E113-8
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3. Turn the throttle stop screw 2
 in direc-
tion a
 or b
 until the specified engine
idle speed is obtained.
NOTE:
To increase the idle speed, turn the throttle
stop screw in direction a
.
To decrease the idle speed, turn the throttle
stop screw in direction b
.
When turning the throttle stop screw in
direction b
, check that the throttle link con-
tacts the screw. If the throttle link does not
contact the throttle stop screw, follow steps
4–6.
4. Check that the throttle...

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Periodic checks and adjustments
3-969M3E11
Checking the TCI unit air gap
1. Remove the fuel tank 1
, manual starter
2
, and flywheel magnet cover 3
.
2. Measure the gap a
 between both pro-
jections b
 and flywheel magnet using a
thickness gauge. Adjust if out of specifi-
cation.
3. Loosen the bolts 4
 and adjust the TCI
unit air gap position.4. Tighten the bolts, and then check the TCI
unit air gap. Adjust if necessary.
Lower unit3
Checking the gear oil level
1. Fully tilt the outboard motor...

69M3E113-10
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Changing the gear oil
1. Fully tilt the outboard up, and then sup-
port it with the tilt stop lever 1
.
2. Slide the trim rod 2
 and position it to the
upper trim rod position a
.
3. Release the tilt stop lever and tilt the out-
board down until it contacts the mount
housing.
4. Place a drain pan under the drain screw
3
, remove the drain screw, then the
check screw 4
 to drain the oil.5. Check the oil for metal, discoloration, and
viscosity. Check the internal parts of the...

CHK 
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Periodic checks and adjustments
3-1169M3E11
Checking the lower unit for air 
leakage
1. Remove the check screw 1
, and then
install the special service tool.
2. Apply the specified pressure to check
that the pressure is maintained in the
lower unit for at least 10 seconds.
CAUTION:
Do not over pressurize the lower unit, oth-
erwise the oil seals may be damaged.
NOTE:
Cover the check hole with a rag when remov-
ing the pressure/vacuum tester from the
lower unit.
3. If pressure drops below...

69M3E113-12
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Lubricating the outboard motor
1. Apply water resistant grease to the areas
shown.
NOTE:
Apply grease to the grease nipple until it
flows from the bushings a
.
2. Apply corrosion resistant grease to the
area shown.
Lower unit / General 

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Periodic checks and adjustments
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— MEMO — 

69M3E11
FUEL
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Fuel system
Special service tools ..................................................................................... 4-1
Hose routing ................................................................................................... 4-2
Fuel and blowby hoses .............................................................................. 4-2
Fuel tank ......................................................................................................... 4-3
Carburetor...

FUELFuel system
4-169M3E11
Special service tools4
Digital tachometer
90890-06760
Pilot screw wrench
90890-03154