Operation Manual

PERIODIC MAINTENANCE
3-10
5. Start the engine and let it warm up for sev-
eral minutes.
6. Check:
• Engine idling speed
Out of specification → Adjust.
Refer to “ADJUSTING THE ENGINE
IDLING SPEED” on page 3-8.
7. Adjust:
• Throttle body synchronization
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a. Turn the cylinder #1 air screw “1” and cylin-
der #2 air screw “2” using the carburetor
angle driver 2 “3”.
TIP
• 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 is removed, turn the screw is
fully, and then turn it out 3/4 turn. Then, syn-
chronize the throttle body.
TIP
The difference in vacuum pressure between
two cylinders should not exceed 1.33 kPa (10
mm Hg).
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8. Measure:
• Engine idling speed
Out of specification → Adjust.
Make sure that the vacuum pressure is
within specification.
9. Stop the engine and remove the measuring
equipment.
10. Adjust:
• Throttle grip free play
Refer to “CHECKING THE THROTTLE
GRIP” on page 3-32.
11. Install:
• All removed parts
EAS21010
CHECKING THE THROTTLE BODY JOINTS
1. Remove:
•Center cover
Refer to “GENERAL CHASSIS” on page
4-1.
2. Check:
• Throttle body joints “1”
Cracks/damage → Replace.
3. Install:
•Center cover
Refer to “GENERAL CHASSIS” on page
4-1.
EAS21050
CHECKING THE CYLINDER HEAD
BREATHER HOSE
1. Remove:
•Center cover
Refer to “GENERAL CHASSIS” on page
4-1.
• Side cover (right)
Refer to “GENERAL CHASSIS” on page
4-1.
Engine idling speed
1100–1300 r/min
Carburetor angle driver 2
90890-03173
Intake vacuum
29.3–31.9 kPa (220–239
mmHg, 8.7–9.4 inHg)
Throttle grip free play
3.0–5.0 mm (0.12–0.20 in)