4
125
-
160 cc
C
WORKSHOP MANUAL
OIL PUMP ASSY
Standard
Service limit
Oil pump rotor
Radial clearance between
inner and outer rotors
0.15 mm
0.20 mm
Pump body radial clearance
0.15 - 0.23 mm
0.25 mm
Front clearance between
surfaces
0.05 - 0.10 mm
0.12 mm
Tightening torques
Pump body screws
10 N
*
m ± 15%
Pump cover screws
2 N
*
m ± 15%
Protection plate A assy
10 N
*
m ± 15%
Protection plate B
10 N
*
m ± 15%
Trouble shooting
Low oil level; possible causes:
1) Normal consumption (check scheduled service has been performed).
2) Oil leaks.
3) Wear or incorrect fitting of piston rings.
4) Wear of valve guide or valve stem.
5) Valve seat rings damaged.
