Removing The Cylinder Head; Checking The Cylinder Head - Yamaha YZF-R6 Service Manual

CYLINDER HEAD
EAS00223

REMOVING THE CYLINDER HEAD

1. Remove:
S cylinder head bolts
S cylinder head
NOTE:
Loosen each bolt and nut 1/2 of a turn at a time,
in stages and in a crisscross pattern. After all of
the bolts and nuts are fully loosened, remove
them.
EAS00229

CHECKING THE CYLINDER HEAD

1. Eliminate:
S combustion chamber carbon deposits (with
a rounded scraper)
NOTE:
Do not use a sharp instrument to avoid damag-
ing or scratching:
S spark plug bore threads
S valve seats
2. Check:
S cylinder head
Damage/scratches ! Replace.
S cylinder head water jacket
Mineral deposits/rust ! Eliminate.
3. Measure:
S cylinder head warpage
Out of specification ! Resurface the cylin-
der head.
Max. cylinder head warpage
0.05 mm
a. Place a straightedge 1 and a thickness
gauge 2 across the cylinder head.
b. Measure the warpage.
c. If the limited in exceeded, resurface the cyl-
inder head as follows.
4-18
ENG