Suzuki DL650 Service Manual page 243

FUEL SYSTEM AND THROTTLE BODY 5-33
Turn the air screw
@
of the gauge so that the vacuum acting
on the tube of that hose will bring the steel ball
@
in the tube
to the center line
@.
NOTE:
The vacuum gauge is positioned approx. 30
"
from the horizon-
tal 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 of the gauge to this nipple.
Turn air screw to bring the other steel ball
(3
to the center
line.
The balancer gauge is now ready for use in balancing the throt-
tle valves.
THROTTLE VALVE SYNCHRONIZATION
To synchronize throttle valves, remove the rubber caps
@
from each vacuum nipples on No.1 and No.2 throttle body.
Connect the vacuum balancer gauge hoses to the vacuum
nipples respectively.
&
0991 3-1 31 21 : Vacuum balancer gauge