Checking The Piston Ring Side Clearance; Checking The Piston Pin Boss Bore; Checking The Piston Pin; Checking The Connecting Rod Small End Inside Diameter - Yamaha F50F Service Manual

POWR
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:
0.02–0.06 mm
(0.0008–0.0024 in)
2nd ring b:
0.02–0.06 mm
(0.0008–0.0024 in)
Oil ring c:
0.04–0.18 mm
(0.0016–0.0071 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:
15.974–15.985 mm
(0.6289–0.6293 in)

Checking the piston pin

1. Measure the
Replace if out of specification.
5-41
Power unit
piston pin diameter.
Piston pin outside diameter:
15.965–15.970 mm
(0.6285–0.6287 in)
Checking the connecting rod small
end inside diameter
1. Measure the connecting rod small end
inside diameter a. Replace the connect-
ing rod if out of specification.
Connecting rod small end inside
diameter a:
15.985–15.998 mm
(0.6293–0.6298 in)
Checking the connecting rod big end
side clearance
1. Measure the connecting rod big end side
clearance a. Replace the connecting
rod or crankshaft, or both if out of specifi-
cation.
6C13G11