Checking The Piston Ring; Checking The Crankshaft - Yamaha F6Z Service Manual

CRANKSHAFT, PISTON AND CYLINDER BODY

CHECKING THE PISTON RING

1. Measure:
End gap


Out of specification
piston ring.
Top ring end gap:
0.15 - 0.30 mm(0.006 - 0.012 in)
2nd ring end gap:
0.30 - 0.45 mm(0.012 - 0.018 in)
Oil ring end gap:
0.20 - 0.70 mm(0.008 - 0.028 in)
NOTE:
Push the piston ring into the cylinder with
the piston crown.
2. Measure:
Side clearance


Out of specification
piston and piston rings as a set.
Top ring side clearance
0.04 - 0.08 mm(0.0016 - 0.0031 in)
2nd ring side clearance
0.03 - 0.07 mm(0.0012 - 0.0028 in)

CHECKING THE CRANKSHAFT

Measure:
Crankshaft runout


Out of specification
crankshaft.
Crankshaft runout limit:
0.03 mm (0.0012 in)
5-50
a
Replace the

b c
and
Replace the

b
:
c
:
Replace the