In the mountains
NTurn the high speed screw (H) slightly clockwise (leaner) – max. up to the stop
If you make the setting too lean it will increase the risk of engine
damage through lack of lubrication and overheating.
At sea level
NTurn the high speed screw (H) slightly counterclockwise (richer) – max. up to the stop
Spark Arresting Screen in Muffler
In some countries, the muffler is fitted with a spark arresting screen.
NIf engine performance deteriorates, check the spark arresting screen in the muffler
NLet the muffler cool down
NRemove chain sprocket cover – see "Mounting the bar and chain"
1 
KN0011BA018
NRemove screw (1)
English
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
NMove the master control lever to the stop position 0
2
0011BA019 KN | 0011BA001 KN |
N Release the chain brake
NPull out spark arresting screen (2)
NClean the dirty spark arresting screen, replace if damaged or heavily carbonized
NReinsert spark arresting screen N Fit screw
N Refit the chain sprocket cover
MS 201, MS 201 C | 39 |