Removing The Cylinder Heads; Checking The Cylinder Heads - Yamaha XV1600A1999 Service Manual

CYLINDER HEADS

REMOVING THE CYLINDER HEADS

1. Remove:
S cylinder head
NOTE:
S Loosen the nuts in the proper sequence.
S Follow the numerical order shown in the il-
lustration. Loosen each bolt 1/4 of a turn at a
time until all of the nuts are loose.
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CHECKING THE CYLINDER HEADS

The following procedure applies to all of the cyl-
inder heads.
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.
3. Measure:
S cylinder head warpage
Out of specification ! Resurface the cylin-
der head.
Maximum cylinder head warpage
0.10 mm
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.
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ENG