Spark Plug
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
NDepress throttle trigger lockout and throttle trigger at the same time and move the Master Control lever to choke closed l.
208BA005 KN
NTurn the knob 90° to the left.
NLift off the carburetor box cover vertically.
4 
3
135BA001 KN
NPlace fingers behind the air filter (3), press thumbs against the housing, swing the filter in the direction of the rear handle and remove it.
NRemove the shutter (4).
208BA020 KN |
NPull off the spark plug boot. N Unscrew the spark plug.
English
Checking the Spark Plug
| KN |
A | 000BA039 |
|
NClean dirty spark plug.
NCheck electrode gap (A) and readjust if necessary – see "Specifications."
NUse only resistor type spark plugs of the approved range.
Rectify problems that have caused fouling of spark plug:
–too much oil in fuel mix,
–dirty air filter,
–unfavorable running conditions, e.g. operating at part load.
MS 250 | 43 |
