Piston Pin And Piston Pin Bearing - Yamaha YB50 Service Manual

INSPECTION AND REPAIR
3. Measure:
• Gap between ends
Outside specified value
of
Use a thickness gauge
Top ring
Second ring
k
Measurement point 20 mm (0.8 in)
a
4. Clearance of piston rings:
The size of the rings is not stamped on its
upper part.
1st Clearance
2st Clearance

PISTON PIN AND PISTON PIN BEARING

1. Inspect:
Piston pin
Blue discolouring/Groove
inspect the lubrication system.
2. Measure:
• External diameter
Outside specified value
3. Measure:
• Clearance of piston pin to piston:
Outside specified value
piston
Clearance of piston pin to piston=
Size of inner diameter (Piston pin) k
External diameter (piston pin housing) k
4-14
rings.
Standard
0.15~0.35 mm
0.15~0.35 mm
Piston ring clearance
k
(Piston pin clip)
a
External diameter (piston pin clip)
9.996 ~ 10.00 mm
Clearance of piston pin to piston
0.004 ~ 0.016 mm
Limit
0.07 mm
ENG
Change set
.
Limit
0.60 mm
0.60 mm
40.25 mm
40.50 mm
Change, then
Change
Change the
-
b
a