Checking The Engine Idle Speed; Checking The Engine Oil - Yamaha F50D Servise Manual

5. Check the fitting again.
6. Check the air intake duct. Clean if there
are obstructions.

Checking the engine idle speed

1. Attach the special service tool 1 to
spark plug wire #1 a.
Digital tachometer 1: 90890-06760
2. Start the engine and warm it up for 10
minutes.
TIP:
Because the Prime Start operates when the
engine is started, the engine idle speed will
be above specification. Therefore, check and
adjust the engine idle speed after the engine
has been warmed up.
3. Check the engine idle speed. Adjust if
out of specification.
Engine idle speed:
4. Turn the throttle stop screw b in direc-
TIP:
9 To increase the idle speed, turn the throttle
stop screw in direction c.
9 To decrease the idle speed, turn the throttle
stop screw in direction d.
1
a
5. After adjusting the idle speed, rev the

Checking the engine oil

1. Place the outboard motor in an upright
2. Remove the oil dipstick, wipe it clean.
3. Insert the dipstick completely for accu-
General periodic maintenance
F50D: 800–900 r/min
FT50C: 900–1000 r/min
tion c or d until the specified engine
idle speed is obtained.
A
b
engine a few times, and then check the
stability of the engine.
position. NOTICE: If the outboard
motor is not level, the oil level indi-
cated on the dipstick may not be
accurate.
rate measurement and remove it again.
0
1
2
d c
3
A
4
5
6
7
8
9
10
b
a
A
10-12