Checking The Decompression System; Installing The Camshafts - Yamaha YZ 2015 Series Owner's Service Manual

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CHECKING THE DECOMPRESSION SYS-
EASB291218
TEM
1. Check:
• Decompression system
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a. Check that the decompressor cam "1"
moves smoothly.
b. Check that the decompressor lever pin "2"
projects from the camshaft.
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INSTALLING THE CAMSHAFTS

EASB291219
1. Install:
• Exhaust camshaft "1"
• Intake camshaft "2"
2
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a. Turn the crankshaft counterclockwise with a
wrench.
TIP
• Apply molybdenum disulfide oil to the cam-
shafts.
• Apply the engine oil on the decompression
system.
b. Align the top dead center (TDC) mark "a" on
the rotor with the alignment mark "b" on the
crankcase cover.
c. Fit the timing chain "3" onto both camshaft
sprockets and install the camshafts on the
cylinder head.
TIP
Make sure that the alignment mark "c" on the
exhaust camshaft sprocket and the alignment
mark "d" on the intake camshaft sprocket are
aligned with the edge of the cylinder head.
d
ECA
5-17
CAMSHAFT
1
b
a
3
c