Yamaha XV19SX(C), Service Manual, Page: 120 / 494

ENGINE
3-7
d. Hold the adjusting screw to prevent it from
moving and tighten the locknut to specifica-
tion.
e. Measure the valve clearance again.
f. 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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13.Install:
• All removed parts
Refer to “CAMSHAFTS” on page 5-17.
NOTE:
For installation, reverse the removal procedure.
EAS20570
SYNCHRONIZING THE THROTTLE BODIES
NOTE:
Prior to synchronizing the throttle bodies, 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.
NOTE:
Place the vehicle on a suitable stand.
2. Remove:
• Rider seat
• Rider seat bracket assembly
Refer to “GENERAL CHASSIS” on page 4-1.
• Cylinder-#1 ignition coil cover
Refer to “ENGINE REMOVAL” on page 5-1.
• Fuel tank
Refer to “FUEL TANK” on page 6-1.
3. Remove:
• Cylinder-#1 intake air pressure sensor brack-
et “1”
• Cylinder-#2 intake air pressure sensor brack-
et “2”
4. Disconnect:
• Cylinder-#1 intake air pressure sensor hose
“1”
• Cylinder-#2 intake air pressure sensor hose
“2”
5. Install:
• Hose “1” (Parts No.: 5JW-24311-00)
• 3-way joint “2” (Parts No.: 90413-05014)
• Vacuum gauge hose for #1 “3”
• Vacuum gauge hose for #2 “4”
• Cylinder-#1 intake air pressure sensor hose
“5”
• Cylinder-#2 intake air pressure sensor hose
“6”
• Vacuum gauge
• Tachometer
T
R
.
.
Locknut (rocker arm adjusting
screw)
20 Nm (2.0 m·kg, 14 ft·lb)
Tappet adjusting tool (4 mm)
90890-04133
Six piece tappet set
YM-A5970
4
3
a
b
2
Vacuum gauge
90890-03094
Carburetor synchronizer
YU-44456
1
2
2
1