Throttle Valve Synchronization - Suzuki AN650 2002 Service Manual

7-24 FUEL SYSTEM AND THROTTLE BODY

THROTTLE VALVE SYNCHRONIZATION

Check and adjust the throttle valve synchronization between two
cylinders. To synchronize throttle valves, disconnect the IAP
sensor's vacuum hoses from the vacuum nipples on the respec-
tive throttle bodies and connect the vacuum balancer gauge
hoses to each vacuum nipple.
NOTE:
Before balancing the throttle valves, calibrate each vacuum bal-
ancer gauge.
• Remove the front box. (
• Start up the engine and run it in idling condition for warming
up.
• Stop the warmed-up engine.
• Connect a tachometer and start up the engine.
• Bring the engine rpm to 1 200 rpm by the throttle stop screw.
• Check the vacuum of the two cylinders and balance the two
throttle valves with the synchronizing screw A.
NOTE:
* During balancing the throttle valves, always set the engine
rpm at 1 200 rpm, using throttle stop screw.
* After balancing the two valves, set the idle rpm to 1 200 rpm.
For vacuum balancer gauge (09913-13121)
The vacuum gauge is positioned approx. 30° from the horizontal
level, and in this position the two balls should be within one ball
dia. If the difference is larger than one ball, turn the synchroniz-
ing screw on the throttle body and bring the ball to the same
level.
A correctly adjusted throttle valve synchronization has the balls
in the No.1 and No.2 at the same level.
9-18)