Inspection And Repair; Head - Yamaha ttr230 Service Manual

INSPECTION AND REPAIR

INSPECTION AND REPAIR

HEAD

1. Remove:
• Carbon fouling
(from the combustion chamber)
Use a round scraper 1.
NOTE:
Do not use pointed instruments and avoid
producing scratches on:
• Spark plug thread
• Valve seat
2. Check:
• Head
Damages/scratches => Replace.
3. Measure:
• Warping.
Out of specification => Flatten.
4. Flatten:
• Head
************************************
Flattening steps:
• Place a 400 to 600 crocus cloth on a flat
surface and level the head, sanding it in
an 8 pattern.
4-25
ENGINE
Head warping:
Less than 0.03 mm