Removing The Cylinder Heads; Checking The Cylinder Heads; Installing The Cylinder Heads - Yamaha V Star 950 Service Manual

EAS24150

REMOVING THE CYLINDER HEADS

1. Remove:
• Cylinder head bolts
• Cylinder head nuts
TIP
• Loosen the cylinder head nuts in the proper
sequence as shown.
• Loosen each cylinder head nut 1/2 of a turn
at a time. After all of the cylinder head nut
are fully loosened, remove them.
A. Front cylinder head
B. Rear cylinder head
EAS24170

CHECKING THE CYLINDER HEADS

The following procedure applies to all 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. Check:
• Cylinder heads
Damage/scratches → Replace.
3. Measure:
• Cylinder head warpage
Out of specification → Resurface the cyl-
inder head.
Warpage limit
0.05 mm (0.0020 in)
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
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 cylin-
der head as follows.
d. Place 400–600 grit wet sandpaper on a
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.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
EAS24230

INSTALLING THE CYLINDER HEADS

1. Tighten:
• Cylinder head nuts
• Cylinder head bolts
5-21
CYLINDER HEADS