Yamaha F4B Service Manual

10-8
General periodic maintenance
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A
TIP:
Set the digital tachometer to the 2-cycle 1-
cylinder mode because this engine ignites
the spark plug once per crankshaft rotation.
2. Start the engine and warm it up for 5–10
minutes.
3. Check the engine idle speed. Adjust if out
of specification.
4. Turn the throttle stop screw b in
directions b or c until the specified
engine idle speed is obtained.
TIP:
• To increase the engine idle speed, turn the
throttle stop screw b in direction b.
• To decrease the engine idle speed, turn the
throttle stop screw b in direction c.
5. Rev the engine a few times.
6. Stop the engine, and then remove the
special service tool.
Changing the engine oil
The engine oil should be extracted using an
oil changer.
Change the engine oil after the first 20
hours of operation or 3 months, and every
100 hours or at 1-year intervals thereafter.
1. Place the outboard motor in an upright
position. NOTICE: If the outboard
motor is not level, the oil level indi-
cated on the dipstick may not be accu-
rate.
2. Start the engine and warm it up for 5–10
minutes.
3. Stop the engine and leave it off for 5–10
minutes.
4. Remove the dipstick a, and then extract
the oil completely using the oil changer
b.
5. Fill the engine with the specified amount
of the recommended engine oil through
the oil filler hole. Screw in the dipstick a.
NOTICE: Overfilling the oil could
cause leakage or damage. If the oil
level is above the upper level mark,
extract until the level meets the
specified level.
Digital tachometer a: 90890-06760
Engine idle speed: 1450–1550 r/min
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a
bc
b
b
a
Predelivery check / General periodic maintenance

Yamaha F4B Specifications

General

Brand	Yamaha
Model	F4B
Category	Outboard Motor
Language	English