Removing The Cylinder Head Cover; Checking The Cylinder Head Cover - Yamaha YFM660RN Service Manual

CYLINDER HEAD COVER

REMOVING THE CYLINDER HEAD COVER

1.Align:
"I" mark
(with stationary pointer)
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Checking steps:
Turn the crankshaft counterclockwise with a
wrench.
Align the "I" mark 1 on the rotor with the sta-
tionary pointer 2 on the crankcase cover.
When the "I" mark is aligned with the station-
ary pointer, the piston is at the Top Dead
Center (T.D.C.).
NOTE:
When the piston is at the top dead center
(T.D.C.) on the compression stroke, there
should be clearance between the valve stem
tips and their respective rocker arm adjusting
screws.
If there is no clearance, rotate the crankshaft
counterclockwise one turn.
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2.Remove:
Cylinder head cover
NOTE:
Loosen each bolt 1/4 of a turn at a time, in
stages and in a crisscross pattern. After all the
bolts are loosened, remove them.

CHECKING THE CYLINDER HEAD COVER

1.Check:
Cylinder head cover
Cracks/damage → Replace the cylinder
head cover and cylinder head as a set.
5 - 10
ENG