Yamaha 150 Owner's Manual page 72

Trouble Recovery
2. Remove the spark plugs and face the
spark plug holes downward to allow any
water, mud, or contaminants to drain.
3. Drain the fuel from the carburetor, fuel
filter, and fuel line.
4. Feed fogging oil or engine oil through
the carburetor(s) and spark plug holes
while cranking with the manual starter or
emergency starter rope.
5. Take the outboard motor to a Yamaha
dealer as soon as possible.
ECM00400
CAUTION:
Do not attempt to run the outboard motor
until it has been completely inspected.
67
ZMU01910
ZMU01911