Checking Wiring And Connectors; Checking Propeller - Yamaha 20D Owner's Manual

Maintenance
from the flywheel and other rotating
parts while the engine is running.
ECM00490
NOTICE
This procedure must be performed while
the outboard motor is in the water. A
flushing attachment or test tank can be
used.
A diagnostic tachometer should be used for
this procedure. Results may vary depending
on whether testing is conducted with the
flushing attachment, in a test tank, or with the
outboard motor in the water.
1. Start the engine and allow it to warm up
fully in neutral until it is running smooth-
ly.
TIP:
Correct idling speed inspection is only possi-
ble if the engine is fully warmed up. If not
warmed up fully, the idle speed will measure
higher than normal. If you have difficulty ver-
ifying the idle speed, or the idle speed re-
quires adjustment, consult a Yamaha dealer
or other qualified mechanic.
2. Verify whether the idle speed is set to
specification. For idle speed specifica-
tions, see page 9.
EMU29112

Checking wiring and connectors

Check that each grounding wire is properly
G
secured.
Check that each connector is engaged se-
G
curely.
57
EMU32111

Checking propeller

EWM01880
WARNING
You could be seriously injured if the en-
gine accidentally starts when you are
near the propeller.
Before inspecting, removing, or install-
G
ing the propeller, place the shift control
in neutral, turn the main switch to "
(off) and remove the key, and remove
the clip from the engine shut-off switch.
Turn off the battery cut-off switch if
your boat has one.
Do not use your hand to hold the propeller
when loosening or tightening the propeller
nut. Put a wood block between the anti-cavi-
tation plate and the propeller to prevent the
propeller from turning.
Checkpoints
ZMU03737
"
ZMU01897