Yamaha FT50C - Checking the Connecting Rod Small End Inside Diameter; Checking the Connecting Rod Big End Side Clearance; Checking the Connecting Rod Bolt; Checking the Crankshaft

POWR
Power unit
5-41
62Y5A11
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.
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.
Checking the connecting rod bolt
1. Measure the connecting rod bolt thread
diameter at the two points
a
and
b
.
2. Calculate the difference between
a
and
b
. Replace if out of specification.
Checking the crankshaft
1. Measure the crankshaft journal diameter
a
, crank pin diameter
b
, and crank pin
width
c
. Replace the crankshaft if out of
specification.
Connecting rod small end inside
diameter
a
:
15.985–15.998 mm
(0.6293–0.6298 in)
Connecting rod big end side
clearance
a
:
0.05–0.22 mm (0.002–0.009 in)
S62Y5840
Connecting rod bolt thread diameter
limit (difference between
a
and
b
):
0–0.1 mm (0–0.004 in)
S62Y5850
5 mm (0.2 in)
10 mm (0.4 in)