Stihl BG 55 Product Instruction Manual - Page 23

Catalytic Converter, Spark Plug - spark plug gap

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295BA083 KN 000BA039 KN Catalytic Converter Spark Plug Checking the Spark Plug English Power tools with a catalytic converter (depending on model) must be run on a 50 : 1 mixture of unleaded gasoline and STIHL two-stroke engine oil or equivalent two-stroke engine oil - see chapter on "Fuel". The catayltic converter integrated in the muffler reduces the harmful emissions in the exhaust gas. The correct carburetor setting (if adjustable) and strict observance of the prescribed mix ratio of gasoline and twostroke engine oil are essential to minimize harmful emissions and ensure a long catalytic converter service life. If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. 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. Removing the Spark Plug 1 A N Clean dirty spark plug. N Check electrode gap (A) and readjust if necessary - see "Specifications". N 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. N Pull off the spark plug boot (1). N Unscrew the spark plug. BG 55, BG 65, BG 85, SH 55, SH 85 21

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BG 55, BG 65, BG 85, SH 55, SH 85
English
21
Power tools with a catalytic converter
(depending on model) must be run on a
50 : 1 mixture of
unleaded gasoline
and
STIHL two-stroke engine oil
or
equivalent two-stroke engine oil – see
chapter on "Fuel".
The catayltic converter integrated in the
muffler reduces the harmful emissions in
the exhaust gas.
The correct carburetor setting (if
adjustable) and strict observance of the
prescribed mix ratio of gasoline and two-
stroke engine oil are essential to
minimize harmful emissions and ensure
a long catalytic converter service life.
If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
Fit a new spark plug after approx. 100
operating hours
or earlier if the
electrodes are badly eroded.
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.
Removing the Spark Plug
N
Pull off the spark plug boot (1).
N
Unscrew the spark plug.
Checking the Spark Plug
N
Clean dirty spark plug.
N
Check electrode gap (A) and
readjust if necessary – see
"Specifications".
N
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.
Catalytic Converter
Spark Plug
1
295BA083 KN
000BA039 KN
A