Yamaha FT50C - Synchronizing the Carburetors

62Y5A11
4-14
1
2
3
4
5
6
7
8
9
3. Turn the pilot screws
2
in direction
a
until the engine idle speed has
decreased to approximately 50 r/min,
then in direction
b
5/8 turn.
4. Turn the throttle stop screw
3
in direc-
tion
c
or
d
until the specified engine
idle speed is obtained.
NOTE:
• To increase the idle speed, turn the throttle
stop screw in direction
c
.
• To decrease the idle speed, turn the throttle
stop screw in direction
d
.
5. After adjusting the idle speed, rev the
engine a few times and let it idle for at
least 15 seconds to check the stability of
the engine. Adjust the carburetor syn-
chronization if necessary.
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 the
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.
Digital tachometer: 90890-06760
Engine idle speed: 850–950 r/min
Digital tachometer: 90890-06760
Vacuum gauge: 90890-03159
S62Y4380
1
Carburetor