Yamaha YXR660FAS Service Manual download pdf (Page 141)

4 - 11

ENG

CYLINDER HEAD COVER

REMOVING THE CYLINDER HEAD COVER

1. Align:

•“I” mark

(with stationary pointer)

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a. Turn the crankshaft counterclockwise with a

wrench.

b. Align the “I” mark 1 on the rotor with the

stationary pointer 2 on the A.C. magneto

cover. When the “I” mark is aligned with the

stationary pointer, the piston is at the Top

Dead Center (TDC).

NOTE:

• When the piston is at the top dead center

(TDC) 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.

2

1

CHECKING THE CYLINDER HEAD COVER

1. Check:

• cylinder head cover

Cracks/damage → Replace the cylinder

head cover and cylinder head as a set.

CHECKING THE TAPPET COVERS

1. Check:

• tappet cover (intake) 1

• tappet cover (exhaust) 2

Cracks/damage → Replace.

• O-rings 3

New

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