Stihl Br 420 C Manual

10 English / USA
BR 340, BR 340 L, BR 420, BR 420 CUsing the BlowerThe blower is designed for single-
handed operation. It is carried as a 
backpack and operated with the right 
hand on the control handle.
The powerful ground-level airstream can 
be aimed highly accurately and 
effectively. It enables the operator to 
quickly blow-sweep large areas. 
The blower may be used only for the 
operations described in your manual.
The blower can be used for clearing 
leaves, grass, paper, dust and light snow 
in...

11 BR 340, BR 340 L, BR 420, BR 420 CEnglish / USA
Using the Vacuum Attachment
(special accessory) 
The vacuum is designed to pick up dry 
material such as leaves, grass, small 
twigs and bits of paper.
!
Warning!
To reduce the risk of 
personal injury from fire 
and explosion, never 
attempt to pick up hot or 
burning substances (e.g. 
smoldering ashes, 
glowing cigarettes)
or combustible fluids (e.g. 
gasoline, paint thinners).
MAINTENANCE, REPAIR AND
STORINGMaintenance, replacement, or repair 
of the...

12 English / USA
BR 340, BR 340 L, BR 420, BR 420 CMounting the ElbowA combination wrench and carburetor 
screwdriver are stowed on the underside 
of the blower.
The throttle cable is already 
connected and must not be kinked 
during assembly.
:Push the elbow (1) into the stub (2) 
as far as it will go – the stops on the 
elbow and fan housing stub must 
line up.
:Fit the nut (3) in the hexagon recess 
in the stub.
:Insert the screw in the nut from the 
other side and tighten moderately – 
the elbow must...

13 BR 340, BR 340 L, BR 420, BR 420 CEnglish / USA
Mounting Blower Tube with 
Curved Nozzle*
Operate the machine only with both 
blower tubes properly mounted.
: Push the blower tube (6) into the 
pleated hose (7).
:Push blower tube (12) onto blower 
tube (6) to position ’a’ (long) or ’b’ 
(short), as far as lug (9), and rotate 
it in the direction of the arrow 
(clockwise) to lock.
:Fit the nozzle (13) on the end of the 
blower tube (12) and rotate it 
clockwise to engage the bayonet 
coupling.
* see...

14 English / USA
BR 340, BR 340 L, BR 420, BR 420 CAdjusting the Harness Straps:Pull the ends of the straps 
downward to tighten the harness.Loosening the Harness Straps:Lift the tabs of the two sliding 
adjusters.
:Adjust the straps so that the 
backplate is held firmly and 
comfortably against your back.This engine is certified to operate on 
unleaded gasoline and the STIHL two-
stroke engine oil at a mix ratio of 50:1.
Your two-stroke engine requires a 
mixture of high-quality gasoline and 
quality...

15 BR 340, BR 340 L, BR 420, BR 420 CEnglish / USA
Fuel mix ages
Only mix sufficient fuel for a few days 
work, not to exceed 3 months of storage. 
Store in approved fuel-canisters only. 
When mixing, pour oil into the canister 
first, and then add gasoline. Close the 
canister and shake it vigorously by hand 
to ensure proper mixing of the oil with 
the fuel.       
Dispose of empty mixing-oil canisters 
only at authorized disposal locations.Before fueling, clean the filler cap and 
the area around it...

16 English / USA
BR 340, BR 340 L, BR 420, BR 420 C With the engine stopped and before 
starting, check the air intakes 
between the backplate and 
powerhead for blockages and clean 
if necessary.
A protective screen is available as a 
special accessory to keep the air 
intakes clear.
Only machines with catalytic 
converter
:Move the setting lever to idle 
position.
Machines with a catalytic converter must 
always be switched off with the setting 
lever in the idle position because the 
throttle cable...

17 BR 340, BR 340 L, BR 420, BR 420 CEnglish / USA
:Put the unit on the ground. Check 
that bystanders are well clear of the 
general work area and the nozzle.
:Make sure you have a firm footing: 
Hold the unit with your left hand on 
the housing and put one foot against 
the base plate to prevent it slipping.:Pull the starter grip slowly with your 
right hand until you feel it engage 
and give it a brisk strong pull. Do not 
pull the starter rope out  all the way 
as it might otherwise break.
:Do not...

18 English / USA
BR 340, BR 340 L, BR 420, BR 420 C As soon as engine runs:
:Move the setting lever (2) to the 
lower stop so that the engine settles 
down to idle speed.
To shut down the engine:
:Slide the stop switch (1) to $ 
At very low outside temperatures:
Allow engine to warm up
As soon as engine runs:
:Move the setting lever to the lower 
stop – the engine settles down to 
idle speed.
:Open throttle slightly – warm up 
engine for a short period.If the engine does not start:
If you did not turn...

19 BR 340, BR 340 L, BR 420, BR 420 CEnglish / USA
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...