3-9
PERIODIC MAINTENANCE
EAS30797
SYNCHRONIZING THE THROTTLE BODIES
Before synchronizing the throttle bodies, check
the following items:
• Valve clearance
• Spark plug
• Air filter element
• Throttle body joint
• Fuel hose
• Exhaust system
• Breather hose
Checking the throttle body synchronization
1. Stand the vehicle on a level surface.
Place the vehicle on the centerstand.
2. Remove:
• Bottom side cowling
• Side panel
• Bottom center cowling
Refer to “GENERAL CHASSIS (1)” on
page 4-1.
• Center cover
• Fuel tank cover assembly
• Side cover
• Rear side cowling assembly
• Footboard
Refer to “GENERAL CHASSIS (2)” on
page 4-11.
• Fuel tank
Refer to “FUEL TANK” on page 7-1.
3. Remove:
• Intake air pressure sensor hose “1”
•Cap “2”
4. Install:
• Hose “1”
(Parts No.: 5JW-24311-00)
• 3-way joint “2”
(Parts No.: 68V-24376-00)
• Intake air pressure sensor hose “3”
• Vacuum gauge “4”
5. Install:
• Fuel tank
Refer to “FUEL TANK” on page 7-1.
6. Check:
• Throttle body synchronization
a. Start the engine, warm it up for several min-
utes, and then let it run at the specified en-
gine idling speed.
b. Check the vacuum pressure.
If out of specification Adjust the throttle
body synchronization.
Vacuum gauge
90890-03094
Vacuummate
YU-44456
Engine idling speed
1100–1300 r/min
Difference in vacuum pressure
between the cylinders
0 kPa–1.3 kPa (0 mmHg–
10 mmHg, 0 inHg–0.4 inHg)