Yamaha YZF-R1 Series Service Manual page 114

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 → #3 → #2 → #4
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".
f. Measure the valve clearance #3 with a
thickness gauge.
Thickness gauge
90890-03268
Feeler gauge set
YU-26900-9
g. Turn the crankshaft counterclockwise.
h. When piston #2 is at TDC on the compres-
sion stroke, align the TDC mark "e" on the
generator rotor with the generator rotor
cover slot "b".
PERIODIC MAINTENANCE
i. Measure the valve clearance #2 with a
thickness gauge.
j. Turn the crankshaft counterclockwise.
G088883
k. When piston #4 is at TDC on the compres-
sion stroke, align the TDC mark "f" on the
generator rotor with the generator rotor
cover slot "b".
d b
l. Measure the valve clearance #4 with a
thickness gauge.
5. Remove:
• Camshaft
TIP
• Refer to "CAMSHAFTS" on page 5-18.
• When removing the timing chain and cam-
shafts, fasten the timing chain with a wire to re-
trieve it if it falls into the crankcase.
6. Adjust:
• Valve clearance
a. Pull the rocker arm "1" up, and then re-
move the valve pad "2".
3-7
Thickness gauge
90890-03268
Feeler gauge set
YU-26900-9
Thickness gauge
90890-03268
Feeler gauge set
YU-26900-9
e
b
f b