Service Points; Cylinder Head Inspection - Yamaha WaveRunner GP1200R Service Manual

POWR
CYLINDER HEAD

SERVICE POINTS

Cylinder head inspection

1. Eliminate:
Carbon deposits
(with 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. Inspect:
Cylinder head water jacket
Corrosion/mineral deposits → Clean
or replace.
3. Measure:
Cylinder head warpage
(with a straightedge and thickness
gauge)
Out of specification/score marks →
Resurface.
Warpage limit:
0.1 mm (0.004 in)
NOTE:
Place a 400 ~ 600 grit wet sandpaper on a
surface plate and resurface the cylinder
head using a figure-eight sanding pattern.
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