Yamaha YP250R 2005, Service Manual

Page: 200 / 370

5 - 7
ENG
CYLINDER HEAD
EAS00225
REMOVING THE CYLINDER HEAD
1. Remove:
• camshaft sprocket cover
• V-belt case air filter cover
2. Align:
• “I” mark
a
on the generator rotor
(with the stationary pointer
b
on the gener-
ator cover)
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a. Turn the primary sheave nut on the left side
of the crankshaft counterclockwise to turn
the crankshaft.
b. When the piston is at TDC on the compres-
sion stroke, align the “I” mark
c
on the
camshaft sprocket with the alignment mark
d
on the cylinder head.
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3. Remove:
• camshaft sprocket bolt
1
• timing chain tensioner
(along with the gasket)
• camshaft sprocket plate
2
• camshaft sprocket
3
• timing chain
4
NOTE:
• To prevent the timing chain from falling into
the crankcase, fasten it with a wire.
• While holding the primary sheave nut with a
wrench, remove the camshaft sprocket bolt
1
.
4. Remove:
• cylinder head
NOTE:
• Loosen the cylinder head nuts and bolts in
the proper sequence as shown.
• Loosen each cylinder head nut 1/2 of a turn
at a time. After all of the cylinder head nuts
are fully loosened, remove them.