Yamaha CS50 User Manual

ENG
INSPECTION AND REPAIR
4-11
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

Replace.
• cylinder head water jacket (CS50Z only)
Mineral deposits/ruts

Eliminate.
3. Measure:
• cylinder head warpage
Out of specification Resurface the cylinder
head.

a. Place a straightedge  and a tickness
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.

Maximum cylinder head warpage
0.02 mm

Yamaha CS50 Specifications

General

Fuel Capacity	4.5 liters
Fuel System	Carburetor
Cooling	Air-cooled
Transmission	Automatic
Starting System	Kick start
Brakes	Drum brakes (front and rear)