Yamaha YZF-R15, Service Manual

Page: 169 / 338

5-7 5-8
CYLINDER HEAD CYLINDER HEAD
* Yamaha bond No. 1215 (Three Bond No. 1215)
6 Cylinder head cover 1
7 Cylinder head cover gasket 1
8 Dowel pin 1
9 Timing chain tensioner 1
10 Timing chain tensioner gasket 1
11 Camshaft sprocket 1
12 Decompression cam 1
13 Cylinder head 1
14 Cylinder head gasket 1
15 Dowel pin 2
16 Timing chain guide (exhaust side) 1
For installation, reverse the removal proce-
dure.
Removing the cylinder head
Order Job/Parts to remove Qty Remarks
New
New
New
New
New
New
New
E
E
E
(4)
12
11
14
15
16
15
13
8
7
1
2
6
(4)
(4)
10
9
5
4
3
5
T
R
.
.
10 Nm (1.0 m
•
kg, 7.2 ft Ib)
•
T
R
.
.
10 Nm (1.0 m
•
kg, 7.2 ft Ib)
•
T
R
.
.
10 Nm (1.0 m
•
kg, 7.2 ft Ib)
•
T
R
.
.
13 Nm (1.3 m
•
kg, 9.4 ft Ib)
•
T
R
.
.
22 Nm (2.2 m
•
kg, 16 ft Ib)
•
T
R
.
.
49 Nm (4.9 m
•
kg, 35 ft Ib)
•
T
R .
.
30 Nm (3.0 m
•
kg, 22 ft Ib)
•
LS
E
∗
T
R
.
.
7 Nm (0.7 m
•
kg, 5.1 ft Ib)
•
New
LS
M
REMOVING THE CYLINDER HEAD
1. Align:
• “I” mark “a” on the magneto rotor
(with the stationary pointer “b” on the magneto
cover)
a. Turn the crankshaft counterclockwise.
b. When the piston is at TDC on the compres-
sion stroke, align the “I” mark “c” on the cam-
shaft sprocket with the mark “d” on the
cylinder head.
2. Loosen:
• Camshaft sprocket bolt “1”
NOTE:
While holding the magneto rotor nut with a
wrench “2”, loosen the camshaft sprocket bolt.
3. Remove:
• Camshaft sprocket
NOTE:
To prevent the timing chain from falling into the
crankcase, fasten it with a wire “1”.
4. Remove:
• Cylinder head
• Loosen the bolts in the proper sequence as
shown.
• Loosen each bolt 1/2 of a turn at a time. After
all of the bolts are fully loosened, remove them.
1. Eliminate:
• Combustion chamber carbon deposits
(with a rounded scraper)
NOTE:
Do not use a sharp instrument to avoid damag-
ing or scratching:
• Spark plug bore threads
• Valve seats
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