Stihl BR 430 Product Instruction Manual - Page 23

Spark Plug - problems

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At sea level N Turn high speed screw (H) counterclockwise (richer) - no further than stop. 0002BA049 KN 000BA039 KN Spark Plug Checking the Spark Plug English 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 2 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) vertically. N Unscrew the spark plug (2). BR 350, BR 430 21

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BR 350, BR 430
English
21
At sea level
N
Turn high speed screw (H)
counterclockwise (richer) – no
further than stop.
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)
vertically.
N
Unscrew the spark plug (2).
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.
Spark Plug
2
0002BA049 KN
000BA039 KN
A