Piston Ring - Yamaha YBR 125 Service Manual

Check and repair
3.Measure:
Inner diameter of piston pin hole b
Inner diameter of piston pin hole:
Using limitation:
Exceeding limitation→Replacement

Piston ring

1. Measure:
Side clearance
Exceeding specified value range→Replacing the whole
set of piston and piston ring.
Note:
Before measuring side clearance,get rid of carbon
deposit in piston ring groove and each ring.
2.Measure:
Push the piston ring a into cylinder(at point 5mm to top
Note:
Eject and push piston ring with piston to make the
ring vertical to cylinder surrounding.
4 - 28
15.002 15.013 mm
15.043 mm
Side clearance:
1 ring:0.03 0.07 mm
Using limitation:0.12 mm
2 ring:0.02 0.06 mm
Using limitation:0.12 mm
ENG