Removing The Cylinder Head - Yamaha YP250R 2005 Service Manual

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)
M MMM M MMM M M MMM
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.
L LLL L LLL L L LLL
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.
5 - 7
ENG
M M MMM M M MMM M
L L LLL L L LLL L
M MMM M MMM
L LLL L LLL