Checking The Cylinder Head; Installing The Cylinder Head - Yamaha 2012 TMAX XP500A Service Manual

EAS24120
REMOVING THE CYLINDER HEAD
1. Remove:
• Cylinder head bolts
• Cylinder head nuts
TIP
• Loosen the bolts and 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.
EAS24160

CHECKING THE CYLINDER HEAD

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 head
Damage/scratches → Replace.
• Cylinder head water jacket
Mineral deposits/rust → Eliminate.
3. Measure:
• Cylinder head warpage
Out of specification → Resurface the cyl-
inder head.
Warpage limit
0.03 mm (0.0012 in)
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a. Place a straightedge "1" and a thickness
gauge "2" across the cylinder head.
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
b. Measure the warpage.
c. If the limit 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.
TIP
To ensure an even surface, rotate the cylinder
head several times.
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EAS24240

INSTALLING THE CYLINDER HEAD

1. Install:
• Dowel pins
• Cylinder head gasket
5-19
CYLINDER HEAD
New