Checking The Piston Ring Grooves; Checking The Piston Ring Side Clearance; Checking The Piston Pin Boss Bore - Yamaha F200C Service Manual

POWR
Piston ring end gap d:
Top ring:
0.15–0.30 mm
(0.0059–0.0118 in)
Second ring:
0.30–0.45 mm
(0.0118–0.0177 in)
Oil ring:
0.15–0.60 mm
(0.0059–0.0236 in)
Measuring point e: 20 mm (0.8 in)

Checking the piston ring grooves

1. Measure the
Replace the piston if out of specification.
Piston ring groove:
Top ring a:
1.23–1.25 mm (0.048–0.049 in)
Second ring b:
1.22–1.24 mm (0.048–0.049 in)
Oil ring c:
2.51–2.53 mm (0.099–0.100 in)
5-49
Power unit
piston ring grooves.
Checking the piston ring side
clearance
1. Measure the piston ring side clearance.
Replace the piston and piston rings as a
set if out of specification.
Piston ring side clearance:
Top ring a:
0.04–0.08 mm
(0.0016–0.0031 in)
Second ring b:
0.03–0.07 mm
(0.0012–0.0027 in)
Oil ring c:
0.04–0.13 mm
(0.0016–0.0051 in)

Checking the piston pin boss bore

1. Measure the piston pin boss bore.
Replace the piston if out of specification.
Piston pin boss bore:
21.02–21.03 mm
(0.8276–0.8280 in)
69J1D11