Flushing Power Unit; Cleaning The Outboard Motor - Yamaha 90A Owner's Manual

4. Grease all grease fittings. For further de-
tails, see page 61.
TIP:
For long-term storage, fogging the engine
with oil is recommended. Contact your
Yamaha dealer for information about fogging
oil and procedures for your engine.
EMU28443

Flushing power unit

Perform this procedure right after operation
for the most thorough flushing.
ECM01530
NOTICE
Do not perform this procedure while the
engine is running. The water pump may
be damaged and severe damage from
overheating can result.
1. After shutting off the engine, unscrew
the garden hose connector from the fit-
ting on the bottom cowling.
1. Fitting
1
3
2
ZMU04697
2. Garden hose connector
3. Garden hose adapter
2. Screw the garden hose adapter onto a
garden hose, which is connected to a
fresh water supply, and then connect it
to the garden hose connector.
3. With the engine off, turn on the water tap
and let the water flush through the cool-
ing passages for about 15 minutes. Turn
off the water and disconnect the garden
hose adapter from the garden hose con-
nector.
4. Reinstall the garden hose connector
onto the fitting on the bottom cowling.
Tighten the connector securely. NO-
TICE: Do not leave the garden hose
connector loose on the bottom cowl-
ing fitting or let the hose hang free
during normal operation. Water will
leak out of the connector instead of
cooling the engine, which can cause
serious overheating. Be sure the con-
nector is tightened securely on the
fitting after flushing the engine.
[ECM00541]
TIP:
When flushing the engine with the boat in
●
the water, tilting up the outboard motor un-
til it is completely out of the water will
achieve better results.
For cooling system flushing instructions,
●
see page 53.
EMU28450

Cleaning the outboard motor

After use, wash the exterior of the outboard
motor with fresh water. Flush the cooling
system with fresh water.
Maintenance
55