Derbi GPR 125 Racing, Workshop Manual

Page: 139 / 247

4 - ENGINE
139
46. Fit the rings onto the piston in the following order:
- Bottom ring (oil ring) (71).
- Central ring (scraper) (72).
- Top ring (compression) (73).
FIT THE RINGS IN SUCH A WAY
THAT THE MANUFACTURER’S
MARK IS TOWARDS THE TOP.
LUBRICATE THE PISTON AND
THE RINGS WELL WITH ENGI-
NE OIL.
47. Position:
- The ends of the rings must be staggered 120º.
POSITION THE ENDS OF THE
RINGS AT 120º FROM EACH
OTHER, AS SHOWN IN THE FI-
GURE.
48. Lubricate:
- External surface of the piston
- Rings
49. Fit:
- The piston fitting clamp (74).
Piston fitting clamp:
Ref. 865261
BEFORE REMOVING THE
CIRCLIP FROM THE GUDGEON
PIN, COVER THE BASE OF THE
CYLINDER WITH A CLOTH TO
PREVENT OBJECTS FROM FA-
LLING INTO THE ENGINE.
APPLY ENGINE OIL TO THE
GUDGEON PIN.
THE PISTON HAS A FITTING
POSITION. POSITION THE (
◄ )
MARK POINTING TOWARDS
THE EXHAUST SIDE.
50. Fit:
- The piston (75).
- The piston gudgeon pin (76).
71
72
73
CAUTION
CAUTION
74
75
76
N.B.
N.B.