Spark Arresting Screen in Muffler
4
145BA043 KN
6
5 
KN 
145BA044
If the engine is down on power, check the spark arresting screen in the muffler:
:Allow muffler to cool down.
:Take out the four screws.
:Remove the muffler upper casing (4).
:Bend back the retaining tabs (5).
:Remove the spark arresting screen (6).
:Clean spark arresting screen. If screen is damaged or heavily carbonized, fit a new one.
:Refit the spark arresting screen in the reverse sequence.
Checking the Spark Plug
000BA002 KN
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.
English / USA
If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug.
:Remove spark plug - see “Starting / Stopping the Engine“.
:Clean dirty spark plug.
:Check electrode gap (A) and readjust if necessary – see "Specifications".
: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.
Fit a new spark plug after approx. 100 operating hours
or earlier if the electrodes are badly eroded.
MS 440, MS 440 W, MS 440 C | 45 |