Yamaha R1 Series 2015, Service Manual

Page: 365 / 704

CYLINDER HEAD
5-24
EAS30276
REMOVING THE CYLINDER HEAD
1. Remove:
•
Intake camshaft
• Exhaust camshaft
Refer to “REMOVING THE CAMSHAFTS”
on page 5-13.
2. Remove:
• Cylinder head bolt (M6) (
u
2)
•
Cylinder head bolt (M9) (
u
10)
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.
EAS30277
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
o
Replace.
•
Cylinder head water jacket
Mineral deposits/rust
o
Eliminate.
3. Measure:
•
Cylinder head warpage
Out of specification
o
Resurface the cylinder
head.
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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 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.
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EAS30282
INSTALLING THE CYLINDER HEAD
1. Install:
• Cylinder head gasket “1”
•
Dowel pins
Warpage limit
0.10 mm (0.0039 in)
10
2
11 7
1
3
2
6
9
12 10 8
5
4
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
New