Honda CB550 Manual page 8

8
3. MAINTENANCE OPERATIONS
Fig, 4 (D Throttle stop screw
Fig.
5 (D Throttle stop screw
®
49±1- 5 mm
(1.
929±0. 059
in.)
@ Stay
Fig . 6
CD
A
adaptor
®
B
adaptor
®
Vacuum gauge
©
Plug hole
2. CARBURETOR ADJUSTMENT
Adjust the carburetor after warming up the
engine (60-70°C/140-158°F Temp).
Idle adjustment
Adjust the engine idle speed to 950-1050
rpm with the throttle stop screw. Turn the
screw clockwise to increase the idle speed and
counterclockwise to decrease the idle speed.
Synchronization adjustment
1.
Remove the fuel tank.
Note:
Position the tank about 50cm (20 in.) higher
than the mounting position and reconnect
with a longer fuel tube.
2. Adjust the throttle stop screw so that
the throttle lever is
49±1.5mm (1 1 ~/
16
±
1 /i&in.) from the stay.
3. Install the vacuum gauge in the inlet
manifolds. Remove the plugs from the
inlet manifolds. Install the longer
A adaptors of ihe vacuum gauge to
the two inside manifolds and the shorter
B adaptors to the outside manifolds.
4. Start the engine, loosen the adjusting lock
nuts and turn the adjusting screws so
that all four carburetors are indicating
uniformly
(16-24cm Hg)
on the vacuum
gauge.
Turn the screw clockwise to increase
vacuum. Turn the screw counterclock-
wise to decrease vacuum. All the carbu-
retors should be adjusted to within
3. 0cm Hg of each other.
Note:
If the
gauge
needle is oscillating over
a
wide range, dampen the movement with the
vacuum
adjuster on the gauge.
Fig. 7
CD
Screw
@Locknut
(