Piston Rings Inspection; Piston Pin And Piston Pin Bearing Inspection - Yamaha MBK YQ100 Service Manual

CYLINDER HEAD, CYLINDER, PISTON
a

PISTON RINGS INSPECTION

1. Measure:
• Side clearance
Out of specification→Replace piston and
/or rings.
Use a feeler gauge
Top ring 0.03 ~ 0.05 mm
2nd ring 0.03 ~ 0.05 mm
2. Install :
• Piston ring
Into the cylinder
Push the ring with the piston crown.
3. Measure :
• End gap
Out of specification→Replace rings
as a set.
Use a feeler gauge
Top ring 0.15 ~ 0.35 mm
2nd ring 0.15 ~ 0.35 mm
a Measuring Point 20 mm
PISTON PIN AND PISTON PIN BEARING
INSPECTION
1. Inspect :
• Piston pin
Blue discoloration/GrooveÆReplace, then
inspect lubrication system.
4-10
ENG
Standard
0.10 mm
0.10 mm
.
Standard Limit
0.60 mm
0.60 mm
Limit