Removing The Cylinder Heads; Checking The Cylinder Heads - Yamaha XV1700P Service Manual

CYLINDER HEADS

REMOVING THE CYLINDER HEADS

1. Remove:
• cylinder head
NOTE:
_
• Loosen the nuts in the proper sequence.
• Follow the numerical order shown in the illus-
tration. Loosen each bolt 1/4 of a turn at a
time until all of the nuts are loose.
EAS00228

CHECKING THE CYLINDER HEADS

The following procedure applies to each cylin-
der heads.
1. Eliminate:
• combustion chamber carbon deposits
(with a rounded scraper)
NOTE:
_
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.
3. Measure:
• cylinder head warpage
Out of specification → Resurface the cylin-
der head.
Maximum cylinder head warpage
0.03 mm (0.0012 in)
M MMM M MMM M M MMM M
a. Place a straightedge and a thickness gauge
across the cylinder head.
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 cylinder
head using a figure-eight sanding pattern.
NOTE:
_
To ensure an even surface, rotate the cylinder
head several times.
L LLL L LLL L L LLL L
5 - 36
ENG
M MMM M M MMM M M MMM M MMM
L LLL L L LLL L L LLL L LLL