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8
9
Adjusting the carburetor
(only for not EU-countries)
E
Carburetor adjustment is necessary for optimum engine
performance, for safer and more economical operation. The
engine should be warm, the air fi lter clean, and the chain
properly tensioned. Have carburetor adjustment done by
an authorised MAKITA service centre.
The carburetor is factory-adjusted for the air pressure at sea
level. At other elevations or under other conditions of weather,
temperature, or humidity, or when breaking in a new engine,
it may be necessary to make slight adjustments to the carbu-
retor.
You will need a tachometer (E/8) (part No. 950 233 210) for
optimum adjustment. Exceeding the maximum permissible
speed can lead to overheating and under-lubricating, and
damage to the engine!
If not using a tachometer, do not go below the specifi ed
basic setting of the main nozzle (H). Doing so may cause
engine damage due to overheating and insuffi cient lubri-
cation!
Adjust the carburetor using a 4 mm screwdriver. The screw-
driver shown (E/9) (part No. 944 340 001) has a molded-on
lug to assist in adjustment.
Before undertaking the adjustment, run the engine for 3-5 mi-
nutes to warm it up, but not at high speed!
For proper adjustment, proceed as follows:
1. Basic setting (engine off)
Start engine and let it warm up.
2. Set idle
3. Check acceleration
4. Set maximum permissible speed
5. Check idle speed
Repeat steps 2-5 until you get the right idle speed, good acce-
leration and maximum permissible speed.
1. Basic setting
Carefully turn the adjusting screws for the main nozzle (H)
and idle nozzle (L) clockwise until you feel a stop.
Turn adjusting screws (H) and (L) 11/4 turn counter-clockwise.
2. Set idle
Set the idle speed per the technical specifi cations.
Turning the adjusting screw (S) in (clockwise) increases the idle
speed. Turning it out (counter-clockwise) lowers the idle speed.
In no case should the chain move.
3. Check acceleration
When the throttle is pressed, the engine should go smoothly
from idle to high speed.
If this is too slow, turn the adjusting screw (L) in small (max.
1/8 turns) increments counter-clockwise.
4. Set maximum permissible speed
Set the maximum speed by minimal adjustments of the
adjusting screw (H) in accordance with the technical
specifi cations. Turning the adjusting screw (H) clockwise
increases the speed, turning it counter-clockwise reduces
the speed.
5. Check idle speed
Check the idle speed after setting the top speed (the chain
must not move).
Repeat the adjustment procedure starting at Step 2, until
the engine runs with the correct idle speed, good accele-
ration, and maximum permissible speed.