Yamaha F100B - Synchronizing the Carburetors

60C5D11
4-20
1
2
3
4
5
6
7
8
9
Synchronizing the carburetors
1. Start the engine and warm it up for 5 min-
utes to check the stability of the engine.
2. Attach the special service tool to high-
tension cord #1
1
.
3. Remove all of the plugs
2
and attach the
special service tool and adapters to the
carburetor assembly as shown.
4. Adjust the idle speed to 1,000 r/min by
turning the throttle stop screw
5
on car-
buretor #4 in direction
a
or
b
.
NOTE:
• To increase idle speed, turn the throttle
stop screw in direction
a
.
• To decrease idle speed, turn the throttle
stop screw in direction
b
.
5. Measure the vacuum pressure of carbu-
retor #4.
Digital tachometer: 90890-06760
Vacuum gauge: 90890-03159
S60C4290
#1
#2
#3
#4
S60C4320
Vacuum gauge (digital)
(commercially obtainable)
3
:
Vacuum gauge (4 analog meters)
(commercially obtainable)
4
:
Vacuum gauge adaptor
(commercially obtainable)
5
:
#1
#2
#3
#4
S60C4330
S60C4340
Carburetor