Adjusting (Carburetor Without Limiter Cap); Standard Setting; Adjusting Idle Speed - Stihl MS 460 Service Manual

– Place the end cover on the
carburetor body.
The pump diaphragm, gasket and
end cover are held in position by
integrally cast pegs.
– Fit the screw and tighten it down
firmly.
MS 460, MS 460 C
12.4 Adjusting (Carburetor
without Limiter Cap)
1 2

Standard setting

(without tachometer)
To readjust the carburetor, start with
the standard setting.
– Carefully screw down both
adjusting screws (H and L) until
they are against their seats.
Then make the following
adjustments:
– Open high speed screw (H)
one full turn.
– Open low speed screw (L)
one full turn.
If no tachometer is available, do not
turn the high speed screw (H)
beyond the standard setting to
make the mixture leaner.
Standard setting
(with tachometer)
– Check the air filter and clean or
replace as necessary.
– Check and clean or replace spark
arresting screen (if fitted).
– Check chain tension.
– Warm up the engine.
– Adjust idle speed.

Adjusting idle speed

– 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 3,300 rpm.
2. Turn low speed screw (L)
clockwise or counterclockwise
to obtain 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
2,500 rpm with the low speed
screw (L).
Starting from the standard setting,
use the high speed screw (H) to
adjust the maximum engine speed
to 13,500 rpm.
If the setting is too lean there is a
risk of engine damage due to
insufficient lubrication and
overheating.
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