Carburetor Adjustment; Basic Setting - Stihl MS 192 T Manual

14.4

Carburetor Adjustment

14.4.1 Basic Setting

Only necessary if the high speed
screw H or low speed screw L has
to be replaced or for cleaning and
setting the carburetor.
– Remove the limiter cap from the
high speed screw, b 14.3.8
The basic setting must be made
after removing the limiter cap.
1
: Turn the high speed screw H (1)
clockwise until it is firmly in its
seat.
: Turn the high speed screw H (1)
anticlockwise until it is one turn
open.
: Turn the low speed screw L (2)
clockwise until it is firmly in its
seat.
: Turn the low speed screw L (2)
anticlockwise until it is one turn
open.
MS 192 T
– Check air filter – clean or replace
if necessary, b 14.1
– Check the chain tension.
– Check the spark arresting screen
(if installed) – clean or replace if
necessary, b 8.1
– Let the engine warm up.
Set idle speed with a speed tester.
Set the specified speeds within the
tolerance range of ± 200 rpm.
1. Set the speed to 3500 rpm
with the idle speed adjusting
screw LA.
2. Turn the
low speed screw L
2
clockwise or anticlockwise to
set the highest speed.
If this speed is more than
3900 rpm, stop the adjustment and
start again with step 1.
3. Set the speed to 3500 rpm again
with the idle speed adjusting
screw LA.
4. Set the speed to 3000 rpm with
the low speed screw L.
5. Set the maximum speed of
13,500 rpm with the high speed
screw H.
6. Fit the limiter cap.
1
Always use a new limiter cap.
Before fitting the limiter cap, it must
be positioned so that the raised part
(1) is below the stop (arrow) on the
carburetor body. Then press the
limiter cap onto the preset high
speed screw.
: Press the limiter cap onto the
high speed screw H.
83