Honda SH125 Manual page 232

ALTERNATOR/STARTER CLUTCH
Install the dowel pins into the right crankcase cover.
Install a new O-ring into the water pump cover
groove.
Install the water pump cover.
Tighten the water pump cover bolts.
Connect the water hose to the right crankcase cover.
Connect the lower radiator hose and bypass hose to
the water pump cover.
Support the scooter using a safety stand or hoist.
Retract the center stand.
Hook the center stand return spring to the spring
pin of the right crankcase cover.
Support the scooter on its center stand.