Removing The Cylinder Heads; Checking The Cylinder Heads - Yamaha FZS600'98 Service Manual

CYLINDER HEAD
EB402101

REMOVING THE CYLINDER HEADS

1. Remove:
S cylinder head nuts
NOTE:
S Loosen the nuts in the proper sequence as
shown.
S Loosen each nut 1/2 of a turn at a time.
After all of the nuts are fully loosened, re-
move them.
EB402403

CHECKING THE CYLINDER HEADS

The following procedure applies to all of the cyl-
inder heads.
1. Eliminate:
S carbon deposits
(from the combustion chambers with a
pounded scraper)
NOTE:
Do not use a sharp instument to avoid dam-
aging or scratching:
S spark plug 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.
Cylinder head warpage
Less than 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 is exceeded, resurface the
cylinder head as follows.
d. Place a 400 X 600 grit wet sandpaper on
the surface plate and resurface the cylin-
der head using a figure-eight sanding pat-
tern.
NOTE:
To ensure an even surface, rotate the cylin-
der head several times.
4-15
ENG