Inspection And Repair; Checking The Cylinder Head - Yamaha CS50 Service Manual

INSPECTION AND REPAIR

INSPECTION AND REPAIR
EAS00229

CHECKING THE CYLINDER HEAD

1. Eliminate:
• combustion chamber carbon deposits (with
a rounded scraper)
NOTE:
Do not use a sharp instrument to avoid dama-
ging or scratching:
• spark plug bore threads
2. Check:
• cylinder head
Damage/scratches
• cylinder head water jacket (CS50Z only)
Mineral deposits/ruts
3. Measure:
• cylinder head warpage
Out of specification Resurface the cylinder
head.
a. Place a straightedge
gauge
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.
4-11
Replace.
Eliminate.
Maximum cylinder head warpage
0.02 mm
across the cylinder head.
ENG
and a tickness