Gilera 633721 Workshop Manual page 116

Engine
- Insert the spring and the by-pass piston on the
flywheel cover.
N.B.
LUBRICATE THE BY-PASS VALVE.
Refitting the flywheel cover components
- Before reassembling, check that all components
are perfectly clean.
- For the cover, carefully check all lubrication chan-
nels, in particular:
- The 3 by-pass channels.
- Oil feeding duct at the water pump shaft connec-
tion.
- Pump drainage duct.
ENG - 116
Nexus 500 euro 3