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Fine tuning for operation at high altitude
If idling behavior is erratic or acceleration is poor
NWarm up the engine.
NTurn the low speed screw (L) 1/8 of a turn (45°) counterclockwise.
Spark Arresting Screen in Muffler
In some countries the muffler is equipped with a spark arresting screen.
NIf the engine is down on power, check the spark arresting screen in the muffler.
NWait for the muffler to cool down.
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.
It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L).
A slight correction of the setting may be necessary if the engine does not run satisfactorily:
N Turn high speed screw (H) |
clockwise (leaner) – no further than |
1 
2 | KN | |
0001BA009 | ||
|
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
stop. |
If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating.
NTake out the screw (1).
NPull out the spark arresting screen (2).
NClean the spark arresting screen. If the screen is damaged or heavily carbonized, fit a new one.
NRefit the spark arresting screen.
NInsert the screw and tighten it down.
NMove the Master Control lever to stop position (0)
NPush the hand guard forward – the chain is locked.
1 |
|
2 |
|
1 | KN |
1 | 001BA199 |
NOpen the twist locks (1) by turning them 1/4 turn counterclockwise with the combination wrench.
NRemove the shroud (2).
40 | MS 362 C |