Adjusting (Carburetor With Limiter Cap); Carburetor With Limiter Caps; Basic Setting - Stihl MS 460 Service Manual

12.4.1 Adjusting (Carburetor
with Limiter Cap)
1 2
Standard setting
Do not remove the limiter cap to
carry out the standard setting.
– With this carburetor it is only
possible to correct the setting of
the high speed screw (H) and low
speed screw (L) within fine limits.
Make the following adjustments:
–
Turn high speed screw (H) counter-
clockwise (max. 3/4 turn) as far as
stop.
– Screw low speed screw (L) down
onto its seat clockwise, then open
it 1/4 turn from that position.
72
Adjusting idle speed
– 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 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).

12.4.2 Basic Setting (

Carburetor with
Limiter Caps)
The limiter caps need to be
removed from adjusting screws only
if it is necessary to replace the high
speed screw (H) or low speed screw
(L) or clean the carburetor.
Carry out the two following steps:
: Turn the limiter caps (arrows)
counterclockwise as far as stop
so that the lugs can be seen in
the carburetor openings.
MS 460, MS 460 C