Service manual

ManualsBrandsYamaha ManualsBoatFX140 WaveRunner 2003

5-59

E

POWR

CYLINDER HEAD

SERVICE POINTS

Cylinder head removal

1. Remove:

• Cylinder head bolts 1

2. Remove:

• Cylinder head nuts

NOTE:

Loosen the cylinder head nuts in the sequence

shown.

Cylinder head inspection

1. Eliminate:

• Combustion chamber carbon deposits

(with a rounded scraper)

NOTE:

Do not use a sharp instrument to avoid damag-

ing or scratching:

• spark plug bore threads

• valve seats

2. Check:

• Cylinder head

Damage/scratches → Replace.

• Cylinder head water jacket

Mineral deposits/rust → Eliminate.