Yamaha R1 Series 2015 Service Manual page 180

2
4. Measure:
• Valve clearance
Out of specification
Valve clearance (cold)
Intake
0.09–0.17 mm (0.0035–0.0067 in)
Exhaust
0.18–0.23 mm (0.0071–0.0091 in)
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a. Turn the crankshaft counterclockwise.
b. When piston #1 is at TDC on the compres-
sion stroke, align the TDC mark "a" on the
generator rotor with the generator rotor cover
slot "b".
TIP
TDC on the compression stroke can be found
when the camshaft lobes are turned away from
each other.
c. Measure the valve clearance #1 with a thick-
ness gauge "1".
TIP
Measure the valve clearance between the cam
lobe and rocker arm "c".
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
1
Adjust.
a b
PERIODIC MAINTENANCE
1
TIP
• If the valve clearance is incorrect, record the
measured reading.
• Measure the valve clearance in the following
sequence.
Valve clearance measuring sequence
Cylinder #1
A. Front
d. Turn the crankshaft counterclockwise.
e. When piston #3 is at TDC on the compres-
sion stroke, align the TDC mark "d" on the
generator rotor with the generator rotor cover
slot "b".
3-6
c
#3 #2 #4
c