Stihl BR 340 Instruction Manual - Page 23

Catalytic Converter, Checking the Spark Plug, unleaded, gasoline, STIHL two cycle engine

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English / USA Catalytic Converter* Checking the Spark Plug Units with a catalytic converter* may only be operated with unleaded gasoline and STIHL two cycle engine oil or equivalent quality two cycle engine oils in a mix ratio of 50:1 (see chapter "Fuel"). The catalylic converter in the muffler reduces noxious emissions in the exhaust gas. Correct adjustment of the carburetor (if adjustable) and observance of the specified mix ratio of gasoline and two cycle engine oil are essential to minimize harmful exhaust emissions and ensure a long catalyst service life. Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation. 000BA002 KN If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. : Remove spark plug - see "Starting / Stopping the Engine". : Clean dirty spark plug. : Check electrode gap (A) and readjust if necessary - see "Specifications". : Use only resistor type spark plugs of the approved range. Rectify problems which have caused fouling of spark plug: : Too much oil in fuel mix. : Dirty air filter. : Unfavorable running conditions, e.g. operating at part load. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. * see "Guide to Using this Manual" 22 BR 340, BR 340 L, BR 420, BR 420 C

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22
English / USA
BR 340, BR 340 L, BR 420, BR 420 C
Units with a catalytic converter* may
only be operated with
unleaded
gasoline
and
STIHL two cycle engine
oil
or equivalent quality two cycle engine
oils in a mix ratio of 50:1 (see chapter
“Fuel”).
The catalylic converter in the muffler
reduces noxious emissions in the
exhaust gas.
Correct adjustment of the carburetor (if
adjustable) and observance of the
specified mix ratio of gasoline and two
cycle engine oil are essential to
minimize harmful exhaust emissions
and ensure a long catalyst service life.
*
see “Guide to Using this Manual”
Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition of
the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.
If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
:
Remove spark plug – see "Starting /
Stopping the Engine".
:
Clean dirty spark plug.
:
Check electrode gap
(A)
and
readjust if necessary – see
"Specifications".
:
Use only resistor type spark plugs
of the approved range.
Rectify problems which have caused
fouling of spark plug:
:
Too much oil in fuel mix.
:
Dirty air filter.
:
Unfavorable running conditions,
e.g. operating at part load.
Fit a new spark plug after approx.
100 operating hours
or earlier if the electrodes are badly
eroded.
Catalytic Converter*
Checking the Spark Plug
000BA002 KN