Yamaha XJR1300(L) 99, Service Manual

Page: 128 / 338

4-16
ENG
CYLINDER HEAD
NOTE:
NOTE:
EAS00223
REMOVING THE CYLINDER HEAD
1. Remove:
cylinder head nuts 1
16
Loosen the nuts in the proper sequence as
shown.
Loosen each nut 1 / 2 of a turn at a time. After all
of the nuts are fully loosened, remove them.
EAS00228
CHECKING THE CYLINDER HEAD
The following procedure applies to all of the cyl-
inder heads.
1. Eliminate:
combustion chamber carbon deposits
(with a rounded scraper)
Do not use a sharp instrument to avoid damag-
ing or scratching:
spark plug threads
valve seats
2. Check:
cylinder head
Damage / scratches
Replace.
3. Measure:
cylinder head warpage
Out of specification
Resurface the cylin-
der head.
Cylinder head warpage
Less than 0.1 mm
a. Place a straightedge 1 and a thickness
gauge 2 across the cylinder head.
b. Measure the warpage.
c. If the limited is exceeded, resurface the cylin-
der 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.