Removing The Cylinder Heads; Checking The Cylinder Heads; Installing The Cylinder Heads - Yamaha Vmax VMX17C 2009 Service Manual

EAS24140

REMOVING THE CYLINDER HEADS

1. Remove:
• Cylinder head bolts
TIP
• 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.
A
5
3
FWD
1
8
B
1
8
FWD
5
3
A. Front cylinder head
B. Rear cylinder head
EAS24170

CHECKING THE CYLINDER HEADS

The following procedure applies to both of the
cylinder heads.
1. Eliminate:
• Combustion chamber carbon deposits
(with a rounded scraper)
TIP
Do not use a sharp instrument to avoid damag-
ing or scratching:
• Spark plug bore threads
• Valve seats
2
7
6 4
4
6
7
2
5-27
CYLINDER HEADS
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.
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 a 400–600 grit wet sandpaper on the
surface plate and resurface the cylinder head
using a figure-eight sanding pattern.
TIP
To ensure an even surface, rotate the cylinder
head several times.
L LLL L LLL L L LLL L L LLL L
EAS24240

INSTALLING THE CYLINDER HEADS

1. Install:
• Cylinder heads
M MMM M M MMM M MMM
2
L LLL L L LLL L LLL