Suzuki Boulevard M50, Service Manual

Page: 259 / 454

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
*1: To vacuum nipple
*2: To vacuum hose
*3: To vacuum balancer gauge hose
• Connect a tachometer.
• Start up the engine and keep it running at 1 100 rpm by turn-
ing throttle stop screw
2
.

• 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
*2
*3
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.
SA
MP
LE