Checking The Cylinder Heads - Yamaha BT1100 2002 Service Manual

CYLINDER HEADS
EAS00228

CHECKING THE CYLINDER HEADS

The following procedure applies to all of the cylin-
der heads.
1. Eliminate:
• combustion chamber carbon deposits
(with a rounded scraper)
NOTE:
Do not use a sharp instrument to avoid damaging
or scratching:
• spark plug threads
• valve seats
2. Check:
• cylinder head
Damage/scratches
3. Measure:
• cylinder head warpage
Out of specification
der head.
Cylinder head warpage
Less than 0.03 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 cylin-
der head as follows
d. Place 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.
4-12
ENG
Replace.
Resurface the cylin-