Standard Setting - Stihl MS 240 Instruction Manual

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: Push the screwdriver (1)
5910 890 2304 through the
opening (arrow) and the pre-
installed limiter cap and into the
high speed screw
– the low speed screw does not
have a limiter cap and can be
adjusted with screwdriver
5910 890 2305.
Adjust idle speed with a tachometer.
Adjust specified engine speeds
within tolerance of ± 200 rpm.
1. Adjust engine speed
with idle speed screw (LA)
to 3,600 rpm.
2. Turn the
low speed screw (L) clockwise
or counterclockwise to obtain
the maximum engine speed.
If this speed is higher than
3,700 rpm, abort the procedure and
start again with step 1.
3. Use the
idle speed screw (LA)
to set engine speed again
to 3,300 rpm.
4. Set the engine speed to
2,800 rpm with the low speed
screw (L)
.
5. Set maximum engine speed
with the high speed screw (H)
(see Specifications), b 3
MS 240, MS 260, MS 260 C
On machines with a catalytic
1
converter, make sure the engine
speeds do not drop below the
minimums specified, b 3.1.
: Push a suitable drift through the
opening (arrow) and push home
the limiter cap until it is flush with
the carburetor body.
The basic setting of the high speed
screw (H) is now fixed.
This completes the basic setting of
the high speed screw (H) and the
low speed screw (L).

14.5.2 Standard Setting

The limiter cap must not be
removed for the standard setting.
Always perform the following steps
before carrying out any
adjustments:
– Troubleshooting, b 4.6
– Check chain tension and readjust
if necessary (see MS 240, 260
instruction manual).
– Inspect the spark arresting
screen (if fitted) and clean or
replace if necessary. b 8.1
– Check the air filter and clean or
replace if necessary, b 14.1
Standard Setting
– Shut down the engine.
– Turn the high speed screw (H)
slowly counterclockwise as far as
stop, but not more than a
3/4 turn.
– Turn the low speed screw (L)
slowly clockwise as far as stop,
then turn it back
1 full turn.
Check running behavior:
The engine must idle and
accelerate smoothly.
Adjusting engine idle speed
– Carry out standard setting.
– Allow engine to warm up.
Engine stalls at idle speed
– Turn the idle speed screw (LA)
clockwise as far as stop or until
the saw chain begins to move.
Then turn it back one quarter
turn.
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