Yamaha GP800R WaveRunner 2003, Service Manual

Page: 109 / 247

5-24
POWR
E
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 grooves)
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 Distance
a
79.899–79.914 mm
(3.1456–3.1462 in)
22 mm
(0.87 in)