ENGINE
3-6
2. Remove:
• Rider seat
Refer to “GENERAL CHASSIS” on page 4-1.
• Fuel tank
Refer to “FUEL TANK” on page 7-1.
• T-bar
Refer to “GENERAL CHASSIS” on page 4-1.
3. Remove:
• Caps “1”
4. Install:
• Vacuum gauge “1”
• Digital tachometer
5. Install:
• Fuel tank
6. Start the engine and let it warm up for several
minutes.
7. Measure:
• Engine idling speed
Out of specification → Adjust.
Refer to “ADJUSTING THE ENGINE IDLING
SPEED” on page 3-8.
8. Adjust:
• Throttle body synchronization
▼▼▼▼▼▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼▼▼
a. With throttle body #3 as standard, adjust
throttle bodies #1, #2, and #4 using the air
screw “1”.
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 (0.39
inHg) (10 mmHg).
▲▲▲▲▲▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲▲▲
Vacuum gauge
90890-03094
Carburetor synchronizer
YU-44456
Engine idling speed
1000–1100 r/min
1
1
1
Vacuum gauge
90890-03094
Carburetor synchronizer
YU-44456
Intake vacuum
33.3 kPa (9.8 inHg) (250 mmHg)
1
1
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