Removing The Cylinder Heads; Checking The Cylinder Heads; Installing The Cylinder Heads - Yamaha XVS13AWC Service Manual

EAS24150

REMOVING THE CYLINDER HEADS

1. Remove:
• Cylinder head bolts
• Cylinder head nuts
NOTE:
• Loosen the nuts and bolts in the proper se-
quence as shown.
• Loosen each nut and bolt 1/2 of a turn at a
time. After all of the bolts and nuts are fully
loosened, remove them.
A
4
5
B
3
1
2
6
A. Front cylinder head
B. Rear cylinder head
EAS24170

CHECKING THE CYLINDER HEADS

The following procedure applies to all of the cyl-
inder heads.
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
6
2
1
3
5
4
5-25
CYLINDER HEADS
2. Check:
• Cylinder heads
Damage/scratches → Replace.
3. Measure:
• Cylinder head warpage
Out of specification → Resurface the cylinder
head.
Warpage limit
0.03 mm (0.0012 in)
M MMM M MMM M M MMM M M MMM M
a. Place a straightedge "1" and a thickness
gauge "2" across the cylinder head.
1
b. Measure the warpage.
c. If the limit is exceeded, resurface the cylinder
head as follows.
d. Place 400–600 grit wet sandpaper on a sur-
face plate and resurface the cylinder head
using a figure-eight sanding pattern.
NOTE:
To ensure an even surface, rotate the cylinder
head several times.
L LLL L LLL L L LLL L L LLL L
EAS24230

INSTALLING THE CYLINDER HEADS

1. Tighten:
• Cylinder head nuts
• Cylinder head bolts
M MMM M M MMM M MMM
2
L LLL L L LLL L LLL