Operating Instructions; Cleaning The Air Filter - Stihl BR 420 Instruction Manual

English
: Fit the spark plug and reconnect the
spark plug boot.
: Move the stop switch to #
Turn the choke knob to e
:
even if the engine is cold.
: Now start the engine.
Fuel tank run until dry and then
refueled
: Pull the starter rope several times to
prime the fuel line.
16

Operating Instructions

During break-in period
A factory new machine should not be run
at high revs (full throttle off load) for the
first three tank fillings. This avoids
unnecessary high loads during the
break-in period.
As all moving parts have to bed in during
the break-in period, the frictional
resistances in the engine are greater
during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.
During operation
After a long period of full-throttle
operation, allow engine to run for a while
at idle speed so that the heat in the
engine can be dissipated by flow of
cooling air. This protects engine-
mounted components (ignition,
carburetor) from thermal overload.
After finishing work
Storing for short period:
Wait for engine to cool down. Drain the
fuel tank and keep the unit in a dry place,
away from sources of ignition, until you
need it again.
Storing for a long period:
see chapter "Storing the Machine".

Cleaning the Air Filter

1
2
1
Dirty air filters reduce engine power
increase fuel consumption and make
starting more difficult.
If there is a noticeable loss of engine
power
Turn choke knob to g
:
: Release the screws (1) and pull
off the filter cover (2).
BR 420