Yamaha XV19SW 2006, Service Manual

Page: 97 / 145

ENGINE
3-8
6. Install:
• Fuel tank
Refer to “FUEL TANK” on page 6-1.
7. Adjust:
• Throttle body synchronization
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a. Start the engine and let it warm up for several
minutes, and then let it run at specified en-
gine idling speed.
b. With throttle body #1 as standard, adjust
throttle body #2 using the air screw “1” (for
throttle body #2).
NOTE:
• After each step, rev the engine two or three
times, each time for less than a second, and
check the synchronization again.
• If the air screw was removed, turn the screw
3/4 turn in and be sure to synchronize the throt-
tle body.
CAUTION:
ECA14900
Do not use the throttle valve adjusting
screws to adjust the throttle body synchroni-
zation.
NOTE:
The difference in vacuum pressure between two
throttle bodies should not exceed 1.33 kPa (10
mmHg).
▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲
8. Stop the engine and remove the measuring
equipment.
9. Adjust:
• Throttle cable free play
Refer to “ADJUSTING THE THROTTLE CA-
BLE FREE PLAY” on page 3-8.
10.Install:
• Fuel tank
Refer to “FUEL TANK” on page 6-1.
• Cylinder-#1 ignition coil cover
Refer to “ENGINE REMOVAL” on page 5-1.
• Rider seat bracket assembly
• Rider seat
Refer to “GENERAL CHASSIS” on page 4-1.
EAS20630
ADJUSTING THE THROTTLE CABLE FREE
PLAY
NOTE:
Prior to adjusting the throttle cable free play, the
engine idling speed and throttle body synchroni-
zation should be adjusted properly.
1. Check:
• Throttle cable free play “a”
Out of specification
→
Adjust.
2. Adjust:
• Throttle cable free play
Engine idling speed
850–950 r/min
Intake vacuum
31.3–35.3 kPa (9.3–10.4 inHg)
(235–265 mmHg)
1
4
6
2
1
3
5
2
1
Throttle cable free play
4.0–6.0 mm (0.16–0.24 in)
Throttle cable free play
4.0–6.0 mm (0.16–0.24 in)
a