Adjusting The Carburetor - Stihl BR 420 Instruction Manual

3
4
: Remove the main filter (3) from the
cover and inspect it –
if it is dirty or damaged, fit a new
one.
: Always install a new prefilter when
you change the main filter.
: Take the prefilter (4) out of the filter
cover.
: If the prefilter is wet, dry it – then
knock it out on the palm of your
hand or blow out with compressed
air.
: Always replace a damaged prefilter.
BR 420
: Clean loose dirt from the filter cover
and filter chamber.
: Install the main filter and prefilter
elements in the filter cover.
: Fit the cover on the filter base (5)
and tighten it down firmly.
5

Adjusting the Carburetor

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
correct the adjustment of the high speed
and low speed screws within fine limits.
English
17