Suzuki GSF650S Service Manual page 162

• If the steel balls are not at the same level, adjust the throttle
valve synchronizing screws 1, 2 and 3.
Adjusting order is as follows.
1 → 2 → 3
• After balancing the carburetor, set the engine speed by turn-
ing the throttle stop screw.
Observe the tachometer reading.
& Engine speed: 1 200 ± 100 r/min
FUEL SYSTEM 4-27