ENGINE
3-8
b. Turn all of the bypass air screws in fully.
c. Using the throttle body with the lowest vacu-
um pressure as the standard, turn out the by-
pass air screws of the other throttle bodies to
adjust them.
NOTE:
• Do not turn out the bypass air screw of the
throttle body with the lowest vacuum pressure.
• After each step, rev the engine two or three
times, each time for less than a second, and
check the synchronization again.
• If an air screw was removed, turn the screw 3/4
turn in and be sure to synchronize the throttle
body.
NOTE:
The difference in vacuum pressure between two
throttle bodies should not exceed 1.33 kPa (10
mmHg).
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7. Stop the engine and remove the measuring
equipment.
8. Allow the engine to cool, and then start the
engine and check that the engine speed does
not rise abnormally high.
9. Adjust:
• Throttle cable free play
Refer to “ADJUSTING THE THROTTLE CA-
BLE FREE PLAY” on page 3-8.
10.Install:
• Caps
• Fuel tank
Refer to “FUEL TANK” on page 7-1.
• 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 carburetor synchroniza-
tion should be adjusted properly.
1. Check:
• Throttle cable free play “a”
Out of specification → Adjust.
2. Adjust:
• Throttle cable free play
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a. Loosen the locknut “1”.
b. Turn the adjusting nut “2” in direction “a” or “b”
until the specified throttle cable free play is
obtained.
c. Tighten the locknut “1”.
WARNING
EWA12910
After adjusting the throttle cable free play,
start the engine and turn the handlebar to the
right and to the left to ensure that this does
not cause the engine idling speed to change.
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EAS20680
CHECKING THE SPARK PLUGS
The following procedure applies to all of the
spark plugs.
Intake vacuum
20.0 kPa (5.9 inHg) (150 mmHg)
Throttle cable free play
3.0–5.0 mm (0.12–0.20 in)
Throttle cable free play
3.0–5.0 mm (0.12–0.20 in)
Direction “a”
Throttle cable free play is increased.
Direction “b”
Throttle cable free play is decreased.
a
1
2
a
b
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