Stihl BG 75 Instruction Manual page 18

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Carry out the standard setting.
Turn the idle speed adjusting screw /$
clockwise until the engine runs smoothly.
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Your carburetor does not have a high
speed adjusting screw (H screw). Adjust-
ment of maximum engine speed is not
necessary.
The carburetor is set at the factory to
guarantee an optimum fuel-air mixture
under all operating conditions.
Idling and part-load emissions are mini-
mized by limiting the idle mixture.
•
Check the air filter and clean it if
necessary.
•
Warm up the engine.
•
Carefully screw the low speed
screw / down onto its seat. Then
open it one turn counterclockwise
(standard setting, /
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Check standard setting.
(L screw must be one turn open)
Turn the idle speed screw /$ clock-
wise until the engine runs smoothly.
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If the engine is down on power, check
the spark arresting screen in the muffler.
•
Remove the housing
Take out the screw  .
Take out the spark arresting
screen  .
•
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Clean the spark arresting screen.
•
If screen is damaged or heavily
carbonized, fit a new one.
•
Install the spark arresting screen.
•
Mount the housing.
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