Yamaha WaveRunner GP1300R 2003 Manuel D'atelier page 244

POWR
CYLINDER HEAD
SERVICE POINTS
Cylinder head inspection
1. Eliminate:
• Carbon deposits
(using a rounded scraper 1)
CAUTION:
Do not use a sharp instrument to avoid
damaging or scratching the cylinder head
or spark plug bore threads.
2. Check:
• Cylinder head water jacket
Corrosion/mineral deposits → Clean or
replace.
3. Measure:
• Cylinder head warpage
(using a straightedge and thickness
gauge)
Out of specification/score marks →
Resurface.
Warpage limit:
0.05 mm (0.002 in)
NOTE:
Place 400–600 grit wet sandpaper on a sur-
face plate and resurface the cylinder head
using a figure-eight sanding pattern.
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