Stihl MS 461 - Standard Setting

86 MS 461, MS 461-R
12.6.3 Standard Setting
The limiter caps (1) must not be
removed for the standard setting.
Always perform the following steps
before carrying out any
adjustments:
– Troubleshooting, b 3.6
– Check chain tension and adjust if
necessary.
– 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 with limiter caps
– Shut off the engine
– Turn the high speed screw (H)
slowly counterclockwise as far as
stop, but not more than
3/4 of a turn.
– Turn the low speed screw (L)
slowly clockwise as far as stop,
but not more than
a 3/4 turn, then turn it back a 1/4
turn.
3443RA299 TG
1
1
Check running behavior:
The engine must idle and
accelerate smoothly.
Standing setting without limiter
caps
– Shut off the engine
– Starting with the high speed
screw (H) and low speed
screw (L) against their seats,
open them both 1 full turn.
Check running behavior:
The engine must idle and
accelerate smoothly.
Adjusting idle speed
– Carry out "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 11/2turns.
Saw chain runs while engine is
idling
– Turn the idle speed screw (LA
) counterclockwise until the chain
stops running, then turn it back
11/2turns.
Erratic idling behavior, poor
acceleration
(although low speed screw = 1/4)
Idle setting too lean.
– Warm up the engine.
– Turn the 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).
Adjustment for operation at high
altitude
A minor correction may be
necessary if engine power is not
satisfactory when operating at high
altitude.
– Check "Setting".
– Warm up the engine.
– Turn the high speed screw (H)
slightly clockwise (leaner) – no
further than stop on versions with
limiter caps.
Turn the adjusting screws only very
slightly. Even minor adjustments
can noticeably affect engine running
behavior.
If the setting is made too lean there
is a risk of engine damage as a
result of lack of lubrication and
overheating.
Readjust carburetor to "Standard
Setting" after returning from high
altitude.