Carburetor Synchronization - Suzuki GSF650S Service Manual

CARBURETOR SYNCHRONIZATION

Check and adjust the carburetor synchronization among the four
carburetors as follows.
USE OF VACUUM BALANCER GAUGE
Calibrating each vacuum gauge
• Start up the engine and run it in idling condition for warming up.
• Stop the warmed-up engine.
• Disconnect the vacuum hoses 1 (for fuel valve) and 2 (for
PAIR valve) from carburetor #1 and #3, and install a cap of
the proper size to each carburetor's vacuum inlet.
• Remove the vacuum inlet cap 3 from the carburetor (for cyl-
inders #2 or #4).
• Connect one of the carburetor balancer's rubber hoses to this
inlet.
% 09913-13121: Vacuum balancer gauge
• Connect a tachometer and start up the engine.
• Bring the engine rpm to 1 750 r/min by the throttle stop screw
4.
FUEL SYSTEM 4-25