English / USA
Checking the Spark Plug
Erratic idling behavior, poor
acceleration
If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
:
Carry out standard setting with the
low speed screw (L).
:
Remove spark plug as described
in chapter "Starting / Stopping the
Engine".
Idle setting too lean:
:
Turn the low speed screw (L)
counterclockwise until the engine
runs and accelerates smoothly.
:
:
Clean dirty spark plug.
Check the electrode gap (A) and
readjust if necessary – see
"Specifications".
It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low speed
screw (L).
:
Use only resistor type spark plugs
of the approved range.
Fine tuning the carburetor for
operation at high altitude
Rectify problems which have caused
fouling of spark plug:
A slight correction may be necessary if
the engine does not run satisfactorily:
Too much oil in fuel mix.
Dirty air filter.
:
:
:
:
:
:
Check the standard setting.
Warm up the engine.
Unfavorable running conditions,
e.g. operating at part load.
Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
Turn the high speed screw (H)
Fit a new spark plug after approx.
100 operating hours
clockwise (leaner).
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.
or earlier if the electrodes are badly
eroded.
BT 121
21
| Categories | Auger Drill Manuals, Stihl Auger Drill Manuals |
|---|---|
| Tags | STIHL BT 121 |
| Download File |
|
| Document Type | Operator's Manual |
| Language | English, Español |
| Product Brand | STIHL. Stihl Inc, USA - Corporate phone: (757) 486-9100. International Support Information: http://stihl.com Email: info@stihl.com, Auger |
| Document File Type | |
| Publisher | stihl.com |
| Wikipedia's Page | Stihl |
| Copyright | Attribution Non-commercial |
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