Removing The Cylinder Head; Checking The Cylinder Head; Installing The Cylinder Head - Yamaha YZF-R1 Series Service Manual

EAS30276

REMOVING THE CYLINDER HEAD

1. Remove:
• Intake camshaft
• Exhaust camshaft
Refer to "REMOVING THE CAMSHAFTS"
on page 5-24.
2. Remove:
• Cylinder head bolt (M6) (× 2)
• Cylinder head bolt (M9) (× 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.
7 11
5
4
10 12
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 → Replace.
• Cylinder head water jacket
Mineral deposits/rust → Eliminate.
3. Measure:
• Cylinder head warpage
Out of specification → Resurface the cylinder
head.
Warpage limit
0.10 mm (0.0039 in)
9
3
1
2
6
8
2
10
5-34
CYLINDER HEAD
G088956
a. Place a straightedge "1" and a thickness
gauge "2" across the cylinder head.
Thickness gauge
90890-03268
Feeler gauge set
YU-26900-9
1
G088957
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 cylin-
der head using a figure-eight sanding pat-
tern.
TIP
To ensure an even surface, rotate the cylinder
head several times.
EAS30282

INSTALLING THE CYLINDER HEAD

1. Install:
• Cylinder head gasket
• Dowel pins
2. Install:
• Cylinder head
• Cylinder head bolt (M6) (× 2)
• Cylinder head bolt (M9) (× 10)
TIP
• Pass the timing chain through the timing chain
cavity.
2
New
New