Yamaha SX150A Owner's Manual page 51

E
cC
When the engine is operated for the first
time or stored for a period of time, a min-
imum of 5 liters (5.3 US qt, 4.4 Imp qt) of
oil should be kept in the remote oil tank.
Otherwise, the oil-feed pump chamber
will not be filled with oil, and no oil will
be supplied.
3-6