Yamaha YZF-R6R Automobile User Manual


 
5-19
CYLINDER HEAD
ENG
NOTE:
NOTE:
NOTE:
EAS00222
REMOVING THE CYLINDER HEAD
1. Remove:
Scylinder head bolts
SLoosen the bolts in the proper sequence as
shown.
SLoosen each bolt 1/2 of a turn at a time. After
all of the bolts are fully loosened, remove
them.
EAS00229
CHECKING THE CYLINDER HEAD
1. Eliminate:
Scombustion chamber carbon deposits
(with a rounded scraper)
Do not use a sharp instrument to avoid damag-
ing or scratching:
Sspark plug bore threads
Svalve seats
2. Check:
Scylinder head
Damage/scratches ! Replace.
Scylinder head water jacket
Mineral deposits/rust ! Eliminate.
3. Measure:
Scylinder head warpage
Out of specification ! Resurface the cylin-
der head.
Maximum cylinder head warpage
0.05 mm (0.002 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 cylinder
head as follows.
d. Place a 400 X 600 grit wet sandpaper on the
surface plate and resurface the cylinder
head using a figure-eight sanding pattern.
To ensure an even surface, rotate the cylinder
head several times.