31FR 350, FR 450, FR 480
English
: Clean away loose dirt from inside
the filter cover and around the filter.
: Remove the filter element (3) and
inspect it – replace if dirty or
damaged.
: Fit the air filter in the cover.
: Push the filter cover into position.
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.
Standard Setting
: Shut off the engine.
: Mount approved cutting tool.
: Check the air filter and replace if
necessary.
: Check adjustment of the throttle
cable and readjust if necessary –
see "Adjusting the Throttle Cable".
: Turn high speed screw (H)
counterclockwise (max.
3
/
4
turn) as
far as stop.
: Carefully screw the low speed
screw (L) down onto its seat. Then
open it one turn counterclockwise.
: Start the engine and run it until it is
warm.
: Adjust idle speed with the idle speed
screw (LA) so that the cutting tool
does not rotate.
Adjusting the Carburetor
255BA001 KN
LA
1
L
H
3/4
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