Inspection And Repair; Cylinder Head; Cylinder And Piston - Yamaha YB50 Service Manual

INSPECTION AND REPAIR

INSPECTION AND REPAIR

CYLINDER HEAD

1. Eliminate:
• Carbon deposits Use a rounded scraper
2. Inspect:
• Cylinder head warping.
Outside specified value
Steps for measuring warping and rectifica-
tion:
• Join a straight edge
bration
• Measure the limit of the warping
• If the warping is outside the specified value,
rectify the cylinder head
NOTE:
Turn the cylinder head several times to avoid
removing too much material from one side

CYLINDER AND PISTON

1. Eliminate:
• Carbon deposits Use a rounded file
2. Inspect:
• Cylinder wall Wear/striping
change
3. Eliminate:
• Carbon deposits
From the piston crown and ring grooves.
4-11
and a thickness cali-
on the cylinder head
Warping limit
0.02 mm
ENG
Rectify
Rectify or