Throttle Valve Synchronization - Suzuki VZ800 Service Manual

6-24 FUEL SYSTEM AND THROTTLE BODY

THROTTLE VALVE SYNCHRONIZATION

Check and adjust the throttle valve synchronization among two
cylinders.
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 hose 1 from the No. 1 (Rear cylin-
der) throttle body.
• Connect one of the vacuum balancer gauge hose to the vac-
uum nipple on the No. 1 throttle body with the special tools.
 13685-02FA0: Three way joint
13681-39F00-225: Hose
• Connect a tachometer.
• Start up the engine and keep it running at 1 100 rpm by turn-
ing throttle stop screw 2.

Avoid drawing dirt into the throttle body while running
the engine without intake pipe and 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 vertical level.
* During balancing the throttle valves, always set the engine
rpm at 1 100 rpm, using throttle stop screw.
*1: To vacuum nipple
*2: To vacuum hose
*3: To vacuum balancer gauge hose
*2
*3
*1