Yamaha 25B, Owner'S Manual

Page: 158 / 214

4-17
GB
000684
q
EMU00991
ADJUSTING IDLING SPEED
w
8
Do not touch or remove electrical parts
when starting or during operation.
8
Keep hands, hair and clothes away
from flywheel and other rotating parts
while engine is running.
c C
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.
1)
Start the engine and allow it to warm up
fully in Neutral until it is running smooth-
ly. If the outboard is mounted on a boat,
be sure the boat is tightly moored.
2) Adjust the throttle stop-screw
1
to set
the idling speed to specification (see
“SPECIFICATIONS” on page 4-1) by
turning the stop-screw clockwise to
increase the idling speed, and turning it
counterclockwise to decrease the idling
speed.
NOTE:
Correct idling-speed adjustment is only pos-
sible if the engine is fully warmed-up. If not
warmed up fully, the speed setting will tend
to be too high. If you have difficulty obtaining
the specified idle, consult a Yamaha dealer
or other qualified mechanic.
69R-9-71 (GB,F,ES) 4B 3/23/02 2:35 PM Page 12