Yamaha VMX12 2001 Service Manual page 79

SYNCHRONIZING THE CARBURETORS
6. Adjust:
• carburetor synchronization
a. Synchronize carburetor #1 to carburetor #2
by turning the synchronizing screw 1 in
either direction until both gauges read the
same.
NOTE:
@
After each step, rev the engine two or three
times, each time for less than a second, and
check the synchronization again.
@
b. Synchronize carburetor #4 to carburetor #3
by turning the synchronizing screw 2 in
either direction until both gauges read the
same.
c. Synchronize carburetor #2 to carburetor #3
by turning the synchronizing screw 3 in
either direction until both gauges read the
same.
Vacuum pressure at engine idling
speed
26.7 kPa (200 mm Hg)
NOTE:
@
The difference in vacuum pressure between
two carburetors should not exceed 1.33 kPa
(10 mm Hg).
@
7. Measure:
• engine idling speed
Out of specification → Adjust.
8. Stop the engine and remove the measuring
equipment.
9. Adjust:
• throttle cable free play
Refer to "ADJUSTING THE THROTTLE
CABLE FREE PLAY".
Throttle cable free play (at the
flange of the throttle grip)
3 ~ 5 mm
10.Install:
• vacuum hose
• vacuum plugs (left and right)
• carburetor joint covers (left and right)
Refer to "CARBURETORS" in chapter 6.
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CHK
ADJ