Yamaha MTN1000 2016 Service Manual page 139

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 thick-
ness gauge.
Thickness gauge
90890-03180
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".
i. Measure the valve clearance #2 with a thick-
ness gauge.
j. Turn the crankshaft counterclockwise.
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 thick-
ness gauge.
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5. Remove:
• Camshaft
TIP
• Refer to "CAMSHAFTS" on page 5-9.
• 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 remove
the valve pad "2".
e
b
3-7
PERIODIC MAINTENANCE
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
f b
2
1