Piston Pin And Small End Bearing; Cleaning; Inspection; Crankshaft - Yamaha 50G Service Manual

POWR

INSPECTION

G63000-0
PISTON PIN AND SMALL END
BEARING

CLEANING

1. Use a soft brush and solvent to clean
the parts.
INSPECTION
1. Visually inspect for surface defects,
breakage, scratches and pitting. If it is
decided to replace the small end bear-
ings, replace them all.
G63500-0*

CRANKSHAFT

INSPECTION
1. Place the crankshaft on a crankshaft-
aligner or on V-blocks.
2. Using a dial gauge, measure the con-
necting-rod axial play.
Maximum axial play:
2.0 mm (0.08 in)
If this axial play is greater than the max-
imum axial play, replace the crankshaft
assembly.
3. Using feeler gauges, measure the con-
necting-rod side clearance.
(50, 60, 70 hp)
Connecting-rod side clearance:
50, 60, 70 hp:
0.2 ~ 0.7 mm (0.008 ~ 0.028 in)
75, 80, 90 hp:
0.12 ~ 0.26 mm (0.005 ~ 0.010 in)
If this side clearance exceeds the speci-
fication, replace the crankshaft assem-
bly.
5-10
E