Yamaha FJR1300A(X), Service Manual

Page: 328 / 754

CYLINDER HEAD
5-23
EAS24120
REMOVING THE CYLINDER HEAD
1. Remove:
• Cylinder head bolts
NOTE:
• 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.
EAS24160
CHECKING THE CYLINDER HEAD
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
2. Check:
• Cylinder head
Damage/scratches
→
Replace.
• Cylinder head water jacket
Mineral deposits/rust
→
Eliminate.
3. Measure:
• Cylinder head warpage
Out of specification
→
Resurface the cylinder
head.
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a. Place a straightedge “1” and a thickness
gauge “2” across the cylinder head.
b. Measure the warpage.
c. If the limit is exceeded, resurface the cylinder
head as follows.
d. Place a 400–600 grit wet sandpaper on the
surface plate and resurface the cylinder head
using a figure-eight sanding pattern.
NOTE:
To ensure an even surface, rotate the cylinder
head several times.
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EAS24240
INSTALLING THE CYLINDER HEAD
1. Install:
• Cylinder head
NOTE:
Pass the timing chain through the timing chain
cavity.
2. Tighten:
• Cylinder head bolts (M10) “1”–“10”
• Cylinder head bolts (M6) “11”, “12”
WARNING
EW3P61013
Replace the bolts with new ones.
NOTE:
Tighten the bolts using the following procedure.
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a. Lubricate the cylinder head bolts and wash-
ers with engine oil.
b. Install the washers and cylinder head bolts.
c. Tighten the cylinder head bolts (M10) in the
proper tightening sequence as shown.
d. Loosen and retighten the cylinder head bolts
in the proper tightening sequence as shown.
Warpage limit
0.10 mm (0.0039 in)
T
R
.
.
Cylinder head bolt (M10)
1st
25 Nm (2.5 m·kg, 18 ft·lb)
New