English
Standard setting B
H | L |
|
208BA024 KN
NTurn high speed screw (H) counterclockwise as far as stop (no more than 3/4 turn).
NTurn the low speed screw (L) carefully clockwise as far as stop, then turn it back 1/4 turn.
Adjusting Idle Speed
NCarry out the standard setting. N Start and warm up the engine.
LA | KN |
| 208BA025 |
Engine stops while idling
NTurn the idle speed screw (LA) clockwise until the chain begins to run – then back it off 1/4 turn.
42
Saw chain runs while engine is idling
NTurn the idle speed screw (LA) counterclockwise until the chain stops moving – then turn it another 1/4 turn in the same direction.
WARNING
If the chain continues moving when the engine is idling, have your saw checked and repaired by your servicing dealer.
Erratic idling behavior, poor acceleration (even though standard setting of low speed screw is correct)
Idle setting is too lean
NTurn the low speed screw (L) counterclockwise, no further than stop, until the engine runs and accelerates smoothly.
It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L).
Fine Tuning for Operation at High Altitude
A slight correction of the setting may be necessary if engine does not run satisfactorily:
NCarry out the standard setting. N Warm up the engine.
NTurn high speed screw (H) slightly clockwise (leaner) – no further than stop.
NOTICE
After returning from high altitude, reset the carburetor to the standard setting.
If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating.
MS 250
