Yamaha YZF-R1S Service Manual page 89

ADJUSTING THE VALVE CLEARANCE
3-12
4. Measure:
S valve clearance
Out of specification ! Adjust.
Valve clearance (cold)
Intake valve
0.11 X 0.20 mm
(0.0043 X 0.0079 in)
Exhaust valve
0.21 X 0.25 mm
(0.0083 X 0.0098 in)
a. Turn the crankshaft counterclockwise.
b. When piston #1 is at TDC on the compres-
sion stroke, align the TDC mark a on the
pickup rotor with the crankcase mating sur-
face b .
NOTE:
TDC on the compression stroke can be found
when the camshaft lobes are turned away from
each other.
c. Measure the valve clearance with a thick-
ness gauge 1 .
NOTE:
S If the valve clearance is incorrect, record the
measured reading.
S Measure the valve clearance in the following
sequence.
Valve clearance measuring sequence
Cylinder #1 ! #2 ! #4 ! #3
A Front
d. To measure the valve clearances of the other
cylinders, starting with cylinder #1 at TDC,
turn the crankshaft counterclockwise as spe-
cified in the following table.
B Degrees that the crankshaft is turned counter-
clockwise
C Cylinder
D Combustion cycle
Cylinder #2
Cylinder #4
Cylinder #3
CHK
ADJ
180_
360_
540_