Yamaha Waverunner 3 Manual

4-22
EFUELFUEL INJECTION SYSTEM
c. Turn synchronizing screw #1 3
 clock-
wise approximately 7 times until it starts
to contact the lever.
NOTE:
Butterfly valve #1 should be fully closed.
Butterfly valves #2 and #3 open if the
screw is turned more than 7 times.
If butterfly valves #1, #2, and #3 are not
fully closed, close the valves by adjusting
synchronizing screw #1 3
.
d. Turn synchronizing screw #3 5
 clock-
wise approximately 7 times until it starts
to contact the lever.
NOTE:
Butterfly valve #4...

4-23
EFUELFUEL INJECTION SYSTEM
NOTE:
For best results, use a vacuum gauge
(commercially obtainable), like 9
 or 0
shown in the illustration, that has four
adapters.
ÈFor USA and Canada
ÉFor worldwide
i. Install the throttle bodies.
NOTE:
Adjust the throttle body synchronization
with the air filter case uninstalled.
j. Connect the fuel hose and clamp.
k. Connect the Yamaha Diagnostic Sys-
tem.
l. Remove the sub wire harness from the
air filter case, and then connect it to the
throttle bodies and main...

4-24
EFUELFUEL INJECTION SYSTEM
Throttle position sensor output 
voltage:
Pink (P) – Black/Orange (B/O)
0.8 
± 0.1 V
NOTE:
To decrease the output voltage, turn the
throttle position sensor clockwise.
Slightly tighten the throttle position screw.
p. Start the engine and let it run at trolling
speed for 20 minutes.
NOTE:
Warm the engine up in the water.
While checking the engine temperature
with the Yamaha Diagnostic System,
warm the engine up until the engine tem-
perature is 50 °C (122 °F).
q. Adjust...

4-25
EFUEL
3. Remove:
• Throttle bodies
 Air filter case
4. Remove:
 Carburetor synchronizer or vacuum 
gauge
5. Install:
 Plugs
6. Install:
 Air filter case
 Throttle bodies
Vacuum pressure at trolling 
speed:
CylinderCylinder 
differenceExample
#1–30 ± 10 mmHg
(–4.00 ± 
1.33 kPa, 
–1.2 ± 0.4 inHg)–210 ± 10 mmHg
(–27.99 ± 
1.33 kPa, 
–8.3 ± 0.4 inHg)
#2 Standard*0–180 mmHg
(–23.99 kPa, 
–7.1 inHg)
 #30 ± 10 mmHg
(0 ± 1.33 kPa, 
0 ± 0.4 inHg)–180 ± 10 mmHg
(–23.99 ± 
1.33 kPa, 
–7.1 ± 0.4 inHg)...

4-26
EFUELFUEL INJECTION SYSTEM
Fuel pressure measurement
1. Disconnect:
Fuel hose
Refer to “Fuel hose disconnection”.
2. Install:
Fuel pressure gauge adapter 1
 
Fuel pressure gauge 2
 
NOTE:
To connect the fuel pressure gauge adapter,
follow the procedures for connecting a fuel
hose. (Refer to “Fuel hose connection”.)
3. Start the engine and arrow it to warm up
for several minutes.
4. Measure:
Fuel pressure
Out of specification →
 Replace the fuel
pump module.
5. Remove:
Fuel pressure gauge
Fuel...

EPOWR
CHAPTER  5
POWER UNIT
ENGINE UNIT .................................................................................................. 5-1
EXPLODED DIAGRAM ............................................................................. 5-1
REMOVAL AND INSTALLATION CHART ................................................ 5-1
SERVICE POINTS .................................................................................... 5-4
Compression pressure measurement...

EPOWR
1
2
3
4
5
6
7
8
9
OIL PUMP ...................................................................................................... 5-26
EXPLODED DIAGRAM ........................................................................... 5-26
REMOVAL AND INSTALLATION CHART .............................................. 5-26
SERVICE POINTS .................................................................................. 5-27
Oil pump removal...

EPOWR
CYLINDER HEAD.......................................................................................... 5-57
EXPLODED DIAGRAM ........................................................................... 5-57
REMOVAL AND INSTALLATION CHART  ............................................. 5-57
SERVICE POINTS .................................................................................. 5-59
Cylinder head removal ...................................................................... 5-59
Cylinder...

EPOWR
CRANKSHAFT .............................................................................................. 5-97
EXPLODED DIAGRAM ........................................................................... 5-97
REMOVAL AND INSTALLATION CHART .............................................. 5-97
SERVICE POINTS .................................................................................. 5-98
Crankshaft removal ........................................................................... 5-98...

5-1
EPOWRENGINE UNIT
ENGINE UNIT
EXPLODED DIAGRAM
REMOVAL AND INSTALLATION CHART
Step Procedure/Part name Q’ty Service points
ENGINE UNIT REMOVAL
Follow the left “Step” for removal.
Engine oil Drain.
Refer to “POWER UNIT” in Chapter 3.
Service lid 1 Refer to “FRONT HOOD” in Chapter 8.
Battery negative and positive lead Refer to “ELECTRICAL BOX AND 
IGNITION COIL BOX” in Chapter 7.
Throttle cable and fuel hose Refer to “FUEL INJECTION SYSTEM” in 
Chapter 4.
Water lock and exhaust joint Refer to “EXHAUST...