Checking The Engine Shut-Off Switch; Checking The Fuel System; Checking The Gear Oil Level; Checking The Gear Shift And Throttle Operation - Yamaha F4B Service Manual

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 top cowling.
5. Remove the dipstick and wipe it clean
using a rag.
6. Screw in the dipstick completely for
accurate measurement and remove it.
7. Check the oil level using the dipstick to
make sure the level falls at the center
between the upper level a and the lower
level b. Add oil if it is below the lower
level b, or extract to the center level if it
is above the upper level a.
a
a
b

Checking the engine shut-off switch

1. Check that the engine turns off when the
clip is pulled from the engine shut-off
switch.
2. Check that the engine turns off when the
engine shut-off switch is pushed.

Checking the fuel system

1. Check that the fuel hoses are securely
connected. See
NOTICE: This is a 4-stroke engine.
Never use premixed fuel or 2-stroke
outboard motor oil.

Checking the gear oil level

1. Place the outboard motor in an upright
position.
2. Remove the check screw a, and then
check the gear oil level in the lower case.
TIP:
If the oil is at the proper level, a small amount
of oil should flow out of the check hole.
3. Install a new gasket b and the check
screw a, and then tighten the check
a
screw to the
NOTICE: Do not reuse a gasket,
always replace it with a new one.
Check screw a:
9 N·m (0.9 kgf·m, 6.6 ft·lb)
Checking the gear shift and throttle
operation
Do not overtighten the friction adjuster. If
there is too much resistance, it could be
difficult to move the throttle grip, which
could result in an accident.
1. Check that the gear shift operates
smoothly when the shift lever is moved
from the N to the F or R position.
Predelivery check
"Fuel hose" (6-1).
specified torque.
b
a
10-4
0
1
2
3
4
5
6
7
8
9
10
A