Yamaha VMX12 2001 Service Manual page 74

ADJUSTING THE VALVE CLEARANCE
8. Measure:
• valve clearance
Out of specification → Adjust.
Valve clearance (cold)
Intake valve
0.11 ~ 0.15 mm
Exhaust valve
0.26 ~ 0.30 mm
a. Turn the crankshaft counterclockwise.
b. When piston #1 is at TDC on the compres-
sion stroke, align the TDC mark a with the
stationary pointer b.
NOTE:
@
TDC on the compression stroke can be found
when the camshaft lobes are turned away from
each other.
@
1 TDC for No. 1 cylinder
2 TDC for No. 2 cylinder
c. Measure the valve clearance with a thick-
ness gauge 3.
NOTE:
@
• If the valve clearance is incorrect, record the
measured reading.
• Measure the valve clearance in the following
sequence.
@
Valve clearance measuring sequence
Cylinder #1 → #3 → #2 → #4
È Front
d. To measure the valve clearances of the
other cylinders, starting with cylinder #1 at
TDC, turn the crankshaft counterclockwise
as specified in the following table.
É Degrees that the crankshaft is turned counter-
clockwise
Ê Cylinder
Ë Combustion cycle
Cylinder #3
Cylinder #2
Cylinder #4
3 - 7
CHK
ADJ
180°
430°
610°