Inspecting Spark Plug; Inspecting Engine Idle Speed; Changing Engine Oil; Inspecting Wiring And Connectors - Yamaha XF375 Owner's Manual

Maintenance
EMU47591

Inspecting spark plug

The spark plug is an important engine component. The
spark plug must be checked every 100 hours. For details,
consult your Yamaha dealer.
Standard spark plug:
ILMAR7E-9
EMU41872

Inspecting engine idle speed

ECM01691
NOTICE
This procedure must be performed while the outboard
motor is in the water.
Inspect the engine idle speed using the meter that is
equipped on the boat. Results may vary depending on
whether testing is conducted with the outboard motor in the
water.
1. Start the engine and allow it to warm up fully in neutral
until it is running smoothly.
2. Inspect the engine idle speed. If the engine idle speed is
out of specification, consult a Yamaha dealer or other
qualified mechanic.
Idle speed (in neutral):
650–750 r/min
EMU47601

Changing engine oil

The engine oil must be changed every 100 hours. For details,
consult your Yamaha dealer.
Recommended engine oil:
YAMALUBE 4M FC-W or 4-stroke
outboard motor oil
Engine oil quantity (without oil filter
replacement):
7.5 L (7.93 US qt, 6.60 Imp.qt)
Engine oil quantity (with oil filter re-
placement):
7.8 L (8.24 US qt, 6.86 Imp.qt)
EMU29116

Inspecting wiring and connectors

 Inspect that each connector is engaged securely.
 Inspect that each ground lead is properly secured.
57
EMU41671

Inspecting propeller

EWM02681
WARNING
You could be seriously injured if the engine accidentally
starts when you are near the propeller. Before inspect-
ing, removing, or installing the propeller, move the con-
trol lever to the neutral position, turn the main switch to
the " " (off) position, 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. Place a block of wood be-
tween the anti-cavitation plate and the propeller to prevent
the propeller from turning.
Checkpoints
 Check each of the propeller blades for erosion from cavi-
tation or ventilation, and other damage.
 Check the propeller shaft for damage.
 Check the splines for wear and damage.
 Check for fish line tangled around the propeller shaft.
1. Propeller shaft
EMU41992

Removing propeller

1. Straighten the cotter pin and pull it out using a pair of pli-
ers.
2. Remove the propeller nut, washer, and spacer.
WARNING! Do not use your hand to hold the propel-
ler when loosening the propeller nut.
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