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Engine Management
Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
major hardware.
MS 192 C
Adjusting the Carburetor
General information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
With this carburetor it is only possible to
adjust the high speed screw within fine
limits.
If the setting is too lean there is a
risk of engine damage due to
insufficient lubrication and
overheating.
Standard setting
Shut off the engine.
N
Check the air filter and clean or
N
replace if necessary.
Check the spark arresting screen
N
(country-specific) in the muffler and
clean or replace if necessary.
Turn the high speed screw (H)
N
counterclockwise as far as stop (no
more than 3/4 turn).
Carefully turn the low speed
N
screw (L)down onto its seat
(clockwise).
Open the low speed screw (L) one
N
full turn.
Adjusting idle speed
Engine stops while idling
Carry out standard setting on low
N
speed screw (L).
Turn the idle speed screw (LA)
N
clockwise until the chain begins to
run – then back it off 2 turns.
Chain runs when engine is idling
Carry out standard setting on low
N
speed screw (L).
Turn the idle speed screw (LA)
N
counterclockwise until the chain
stops running – then turn it another
2 turns in the same direction.
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