Standard Setting - Stihl MS 261 User Manual

Securing the limiter cap
: Insert a drift through the
opening (arrow) and then push
home the limiter cap until it
engages.
This completes the basic setting of
the high speed screw (H) and the
low speed screw (L).
The setting of the high speed
screw (H) is fixed when the limiter
cap (1) is recessed 2mm in the
carburetor body.
MS 261, MS 261 C

12.7.2 Standard setting

1
The limiter cap (1) must not be
removed for the standard setting.
Always perform the following steps
before carrying out any
adjustments:
– Troubleshooting, b
– Check chain tension and adjust if
necessary.
1
– Inspect the spark arresting
screen (if fitted) and clean or
replace if necessary, b 3.7 or
b 6.1
– Check the air filter and clean or
replace if necessary, b 12.1
Standard setting
– Shut off 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.
– Warm up the engine.
Engine stops while idling
– Turn the idle speed screw (LA)
clockwise until the chain begins
to run, then turn it back 1 full turn.
Saw chain runs while engine is
idling
– Turn the idle speed screw (LA
) counterclockwise until the chain
b 3.6
stops running, then turn it back
1 full turn.
Erratic idling behavior, poor
acceleration
(although standard setting is
correct)
Idle setting too lean.
– Warm up the engine.
– Turn low speed screw (L)
counterclockwise until the engine
runs and accelerates smoothly.
It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low
speed screw (L).
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