TIMING, SYNCHRONIZING, & ADJUSTING
90-857046R1 NOVEMBER 2001 Page 2C-9
4. Read the vacuum of cylinder #3. It’s not important to be at any specific vacuum setting.
5. Adjust the carburetor synchronization screws of cylinders #2 and #1 to match the base
vacuum of cylinder #3.
NOTE: Keep viewing the tachometer, as the engine RPM may fluctuate during adjustments.
Keep adjusting the idle RPM screw in order to keep the engine speed at 1000 RPM.
Example
32 cm
30 cm
28 cm
26 cm
Cyl.
# 3
Cyl.
#. 2
Cyl.
# 1
If the vacuum reading of Cyl. #3 (base vacuum) is
30 cm, then adjust carburetor synchronization
screws of cylinders #2, and #1 to 30 cm.
c
a
b
a-Carburetor Synchronization Screw #1
b-Carburetor Synchronization Screw #2
c-Throttle Cam
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