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Yamaha F50A - Synchronizing the Carburetors

Yamaha F50A
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FUEL
Fuel system
4-23
62Y3A11
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.
NOTE:
For best results, use a vacuum gauge
3
(commercially obtainable) with four adapters
like the one shown in the illustration.
4. Adjust the idle speed to 1,000 r/min by
turning the throttle stop screw
4
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
.
Inductive self-powered tachometer:
YU-08036-B
Digital tachometer: 90890-06760
Carburetor synchronizer: YU-08030
Vacuum gauge: 90890-03159
S62Y4380
1

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