Yamaha WaveRunner GP1200R Manuel D'entretien page 218

POWR
PISTONS
SERVICE POINTS
Piston pin clip removal and installation
1. Remove and install:
Piston pin clip
NOTE:
Before removing or installing the piston pin
clip, cover the crankcase opening with a
clean rag to prevent the piston pin clip from
falling into the crankcase.
Piston inspection
1. Eliminate:
Carbon deposits
(from the piston crown and piston
ring gloves)
2. Inspect:
Piston wall
Score marks → Repair with 600 ~ 800
grit wet sandpaper or replace.
NOTE:
Lightly sand the piston wall in a crisscross
pattern.
3. Measure:
Piston skirt diameter
(with a micrometer)
Out of specification → Replace.
Piston diameter
79.899 ~ 79.914 mm
(3.1456 ~ 3.1462 in)
5-27
E
Distance a
22 mm
(0.87 in)