Yamaha MT-01 Service Manual page 664

Manuals by Motomatrix / www.motomatrix.co.uk
EAS24140
REMOVING THE CYLINDER HEADS
1. Remove:
• Cylinder head nuts
NOTE:
• Loosen the nuts in the proper sequence as
shown.
• Loosen each nut 1/2 of a turn at a time. After all
of the nuts are fully loosened, remove them.
B
6
2
4
A. Front cylinder
B. Rear cylinder
EAS24170
CHECKING THE CYLINDER HEADS
The following procedure applies to all of the cyl-
inder 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
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3
1
5
5-32
CYLINDER HEADS
2. Check:
• Cylinder head
Damage/scratches → Replace.
3. Measure:
• Cylinder head warpage
Out of specification → Resurface the cylinder
head.
Warpage limit
0.03 mm (0.0012 in)
M MMM M MMM M M MMM M M MMM
a. Place a straightedge and a thickness gauge
across the cylinder head.
b. Measure the warpage.
c. If the limit is exceeded, resurface the cylinder
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 L LLL
EAS24220
CHECKING THE OIL PIPE
1. Check:
• Oil pipe
Damage → Replace.
Obstruction → Wash and blow out with com-
pressed air.
M M MMM M M MMM M MMM
L L LLL L L LLL L LLL