Manual Stihl BR420 (page 9 of 74) (English)

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English / USA

BR 340, BR 340 L, BR 420, BR 420 C

Muffler and Catalytic Converter

!Warning!

The muffler and other parts of the engine

(e.g. fins of the cylinder, spark plug)

become hot during operation and remain

hot for a while after stopping the engine.

To reduce risk of burns do not touch the

muffler and other parts while they are

hot.

!Warning!

To reduce the risk of fire or burn injury,

let the unit cool down before refueling

your power tool after use.

!Warning!

Never disassemble or modify your

muffler. The muffler could be damaged

and cause an increase in heat radiation

or sparks, thereby increasing the risk

of fire or burn injury. You may also

permanently damage the engine. Have

your muffler serviced and repaired by

your STIHL servicing dealer only.

!Warning!

To reduce the risk of fire or burn injury,

keep the area around the muffler clean.

Remove all debris such as pine needles,

branches or leaves.

!Warning!

Some STIHL blower

models are equipped with

a catalytic converter,

which is designed to

reduce the exhaust

emissions of the engine

by a chemical process in the muffler.

Due to this process, the muffler does not

cool down as rapidly as conventional

mufflers when the engine returns to idle

or is shut off. To reduce the risk of fire

and burn injuries, the following specific

safety precautions must be observed.

!Warning!

Since a muffler with a catalytic converter

cools down less rapidly than

conventional mufflers, always set your

backpack blower down in the upright

position and never locate it where the

muffler is near dry brush, grass, wood

chips or other combustible materials

while it is still hot.

Let the engine cool down sitting on

concrete, metal, bare ground or solid

wood (e.g. the trunk of a felled tree)

away from any combustible substances.

!Warning!

An improperly mounted or damaged

cylinder housing or a damaged/

deformed muffler shell may interfere

with the cooling effect of the catalytic

converter. To reduce the risk of fire or

burn injury, do not continue work with a

damaged or improperly mounted

cylinder housing or a damaged/

deformed muffler shell. Your muffler is

furnished with a screen designed to

reduce the risk of fire from the emission

of hot particles. Due to the heat from the

catalytic reaction, this screen on a

catalytic converter will normally stay

clean and need no service or

maintenance. If you experience loss of

performance and you suspect a clogged

screen, have your muffler maintained by

a STIHL servicing dealer.

My Stihl BR420/420C has after 15 years developed a gasoline leak. I fill tank with gasoline. Next day it’s empty. I removed tank, cleaned it up and inflated the tank with air compressor. Tank holds air without air leaks. Cleaned fuel lines. So no broken areas.
Can someone advise me on where to look and what to replace? Submitted on 1-12-2021 at 02:11
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Others manual(s) of Stihl BR420

Stihl BR420 User Manual - German - 36 pages

Stihl BR420 User Manual - Spanish - 70 pages

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Stihl BR420 Manual

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