Yamaha Waverunner 3 Manual

3-14
E
INSP
ADJ
POWER UNIT
NOTE:
The new valve pad number is only an
approximation. The valve clearance must
be measured again and the above steps
should be repeated if the measurement is
still incorrect. 
Install the new valve pad 5
 and the valve
lifter 6
.
NOTE:
Lubricate the valve pad with molybdenum
disulfide grease. 
Lubricate the valve lifter with molybdenum
disulfide oil. 
The valve lifter must turn smoothly when
rotated by hand. 
Install the valve lifter and the valve pad in
the correct...

3-15
E
INSP
ADJ
POWER UNIT
Intake
Exhaust
MEASURED 
CLEARANCEORIGINAL VALVE PAD NUMBER
120 125 130 135 140 145
150 155 160 165 170 175 180 185 190 195 200 205 210 215 220 225 230 235 240
0.00–0.02 120 125 130
135 140 145 150 155 160 165 170 175 180 185 190 195 200 205 210 215 220 225
0.03–0.07 120 125 130 135
140 145 150 155 160 165 170 175 180 185 190 195 200 205 210 215 220 225 230
0.08–0.10 120 125 130 135 140
145 150 155 160 165 170 175 180 185 190 195 200 205 210 215 220 225 230 235
0.11–0.20...

3-16
E
INSP
ADJ
POWER UNIT
9. Remove:
Dial gauge
Dial gauge stand
Dial gauge needle
10. Install:
All removed parts
NOTE:
For installation, reverse the removal proce-
dure.
Engine oil level check
1. Place the watercraft in a horizontal posi-
tion.
2. Check:
Engine oil level
Checking steps:
CAUTION:
When checking the oil level in water,
stay clear of other boats. The water-
craft could be drifted away by the cur-
rent or wind.
Do not run the engine for more than 15
seconds without supplying water,...

3-17
E
INSP
ADJ
POWER UNIT
Remove the oil filler cap 1
 and check for
oil on the dipstick 2
.
If there is no oil on the dipstick, pour
enough oil so that the tip of the dipstick
comes into contact with the oil, and then
install the filler cap.
In water
a. Place the watercraft in water, and then
start the engine.
b. Run the engine at 7,000 r/min or more
for more than 5 minutes.
c. Run the engine at trolling speed for 2–
3 minutes.
d. Stop the engine.
On land
a. Connect the flushing hose connector to...

3-18
E
INSP
ADJ
POWER UNIT
If the engine oil is below the minimum
level mark a
, add sufficient oil of the rec-
ommended type to raise it to the correct
level. 
If the engine oil is above the maximum
level mark b
, extract sufficient oil using
an oil changer to lower it to the correct
level.
NOTE:
If the oil temperature is low, the reading on
the dipstick will be low, and if the tempera-
ture is high, the reading on the dipstick will
be high.
Engine oil change — using oil changer
 WARNING
Avoid...

3-19
E
INSP
ADJ
POWER UNIT
2. Remove:
Oil filler cap 1
 
1
3. Insert the tube of an oil changer into the oil
filler hole.
4. Operate the oil changer to extract the oil.
5. If the oil filter is also to be replaced, per-
form the following procedure.
Replacing steps:
Place a rag under the oil filter.
Remove the oil filter 1
 with an oil filter
wrench 2.
Oil filter wrench:
YU-38411/90890-01426
Lubricate the O-ring 3 of the new oil filter
with a thin coat of engine oil.
CAUTION:
Make sure the O-ring 3 is...

3-20
E
INSP
ADJ
POWER UNIT
6. Pour the specified amount of the recom-
mended engine oil into the oil filler hole.
7. Fill:
Oil tank 
(with the specified amount of the recom-
mended engine oil)
CAUTION:
When starting the engine make sure the
dipstick is securely fitted into the oil tank.
8. Install:
Oil filler cap
Recommended oil:
SAE 10W-30
API SE, SF, SG, SH, SJ
Oil quantity:
Total amount:
4.3 L (4.5 US qt, 3.8 Imp qt)
With oil filter replacement:
2.2 L (2.3 US qt, 1.9 Imp qt)
Without oil filter...

3-21
E
INSP
ADJ
POWER UNIT
2. Remove the air filter element and check it
for dirt and oil. Replace the air filter ele-
ment if there is any oil buildup.
CAUTION:
Make sure that the air filter element is
installed in the filter case properly.
Do not start the engine with the air filter
element removed, otherwise the engine
could be damaged.
If cleaning the air filter element, use cold
or lukewarm water and let it air dry com-
pletely. Do not use detergent or an sol-
vent to clean the air filter...

3-22
E
INSP
ADJ
POWER UNIT
3. Inspect:
Electrodes 1
 
Damage/wear →
 Replace.
Insulator color 2
 
Distinctly different color →
 Check the
engine condition. 
4. Clean:
Spark plug
(with a spark plug cleaner or wire brush)
5. Measure:
Spark plug gap a
 
Out of specification →
 Regap.
Color guide:
Medium to light tan color:
Normal
Whitish color:
Lean fuel mixture
Air leak
Incorrect settings
Blackish color:
Overly rich mixture
Electrical malfunction
Defective spark plug
Spark plug gap:
0.7–0.8 mm...

3-23
E
INSP
ADJ
POWER UNIT/ELECTRICAL
7. Install:
Air filter element
Air filter case cover
T R..
Air filter case cover screw:
2.5 N  m (0.25 kgf  m, 1.8 ft  lb)
LOCTITE
® 572
ELECTRICAL
Battery inspection
 WARNING
Battery electrolyte is poisonous and dan-
gerous, causing severe burns, etc. Electro-
lyte contains sulfuric acid. Avoid contact
with skin, eyes or clothing. 
Antidotes
External: Flush with water. 
Internal: Drink large quantities of water or
milk. Follow with milk of magnesia, beaten
egg...