Synchronizing The Throttle Body - Yamaha 2009 XP500Y TMAX Service Manual

• Turn the crankshaft clockwise several full turns
to seat the parts.
h. Measure the valve clearance again.
i. If the valve clearance is still out of specifica-
tion, repeat all of the valve clearance adjust-
ment steps until the specified clearance is
obtained.
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9. Install:
• All removed parts
TIP
For installation, reverse the removal procedure.
10.Adjust:
• Throttle cable free play
Refer to "ADJUSTING THE THROTTLE CA-
BLE FREE PLAY" on page 3-9.
EAS20571

SYNCHRONIZING THE THROTTLE BODY

TIP
Prior to synchronizing the throttle body, the
valve clearance and the engine idling speed
should be properly adjusted and the ignition tim-
ing should be checked.
1. Stand the vehicle on a level surface.
TIP
Place the vehicle on the centerstand.
2. Remove:
• Bottom cowling
Refer to "GENERAL CHASSIS" on page 4-1.
3. Remove:
• Synchronizing pipe caps "1"
4. Install:
• Vacuum gauge "1"
(onto the synchronizing pipes)
• Digital tachometer
(onto the spark plug lead of cylinder #1)
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3-7
Vacuum gauge
90890-03094
Carburetor synchronizer
YU-44456
Digital tachometer
90890-06760
YU-39951-B
1
5. Start the engine and let it warm up for several
minutes.
6. Check:
• Engine idling speed
Out of specification → Adjust.
Refer to "ADJUSTING THE ENGINE IDLING
SPEED" on page 3-8.
Engine idling speed
1100–1300 r/min
7. Adjust:
• Throttle body synchronization
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a. Turn the cylinder #1 air screw "1" and cylinder
#2 air screw "2" using the carburetor angle
driver "3".
3
TIP
• After each step, rev the engine two or three
times, each time for less than a second, and
check the synchronization again.
• If an air screw was removed, turn the screw in
fully, and then turn it out 3/4 turn. Then, syn-
chronize the throttle body.
ENGINE
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2