Suzuki GSX-R750, Service Manual

Page: 225 / 495

4-78 FI SYSTEM AND INTAKE AIR SYSTEM
• Connect one of the four rubber hoses of the vacuum balancer
gauge to the nipple
1
on the No.1 throttle body.
09913-13121: Vacuum balancer gauge
• Connect a tachometer.
• Start up the engine and keep it running at 1 200 rpm by turning
throttle stop screw
2
.
Avoid drawing dirt into the throttle body while running
the engine without air cleaner box. Dirt drawn into the
engine will damage the internal engine parts.
• Turn the air screw
3
of the gauge so that the vacuum acting on
the tube of that hose will bring the steel ball
4
in the tube to the
center line
5
.
NOTE:
The vacuum gauge is positioned approx. 30° from the horizontal
level.
• After making sure that the steel ball stays steady at the center
line, disconnect the hose from the No.1 throttle body nipple
and connect the next hose to this nipple.
• Turn air screw to bring the other steel ball
6
to the center line.
• Repeat the above process on the third and fourth hoses.
The balancer gauge is now ready for use in balancing the throttle
valves.