English / USA
Checking the Spark Plug
Cutting tool rotates when engine is
idling
If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
:
Turn idle speed screw (LA) slowly
counterclockwise until cutting tool
stops rotating and then turn the
screw about another /2 to 1turn in
the same direction.
:
Remove spark plug as described
in chapter "Starting / Stopping the
Engine".
1
:
:
Clean dirty spark plug.
Check the electrode gap (A) and
readjust if necessary – see
"Specifications".
Erratic idling behavior, engine stops
even though setting of LA screw is
correct, poor acceleration
:
Use only resistor type spark plugs
of the approved range.
Idle setting too lean:
:
Turn low speed screw (L)
counterclockwise (about 1/4 turn)
until the engine runs and
accelerates smoothly.
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.
Erratic idling behavior
Idle setting too rich:
:
Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
Fit a new spark plug after approx.
100 operating hours
or earlier if the electrodes are badly
eroded.
Turn low speed screw (L) clockwise
(about 1/ turn) until the engine runs
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.
4
and accelerates smoothly.
40
FS 120, FS 120 R, FS 200, FS 200 R, FS 250, FS 250 R
| Categories | Blower Vacuum and Sweeper Manuals, STIHL Trimmer Manuals, Trimmer Manuals |
|---|---|
| Tags | STIHL FS 120, STIHL FS 200, STIHL FS 250 |
| Download File |
|
| Language | English, Español |
| Product Brand | STIHL. Stihl Inc, USA - Corporate phone: (757) 486-9100. International Support Information: http://stihl.com Email: info@stihl.com, Trimmer |
| Document File Type | |
| Publisher | stihl.com |
| Wikipedia's Page | Stihl |
| Copyright | Attribution Non-commercial |
(1 votes, average: 4 out of 4)
Lawn and Garden readers have rated STIHL FS 120 200 250 Trimmer Owners Manual 4.0 out of 4.0 based on 1 product reviews. You get what you paid for have FS 120 trimmer running like today I got it . If you maintain them and clean them after use they will last forever definitely would buy another one