Stihl HS 75 - Page 6

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This carburetor does not include an adjusting screw for maximum speed (H screw), as adjustment of the ma-
ximum speed is not required.
The carburetor is tuned so that the engine is supplied with the optimum fuel/air mixture in all operating condi-
tions. Setting a maximum limit for the idle speed mixture also limits the emissions at idle speed and
part-throttle operation.
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/ Back off  turn
• Check cutters - clean if necessary
(must be clean, move easily, not deformed)
• Check air filter - clean if necessary
• Let engine run until operating temperature is rea-
ched
/ Carefully turn the low-speed adjusting screw
clockwise as far as possible, then back off one turn
counterclockwise (standard setting / ).
Set the idle speed to 2800 rpm via /$ = idle-speed
adjusting screw.
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a) Adjust to standard setting (/ )!
b) / Turn low-speed adjusting screw one
quarter turn counterclockwise
c) Adjust the idle speed to approx. 2800 rpm by
means of the /$ = idle-speed adjusting screw
Repeat adjustments b) and c) if necessary!
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a) Adjust to standard setting (/ )!
b) Turn low-speed adjusting screw one eighth-turn
clockwise
c) Adjust the idle speed to 2800 rpm by means
of the /$ = idle-speed adjusting screw
Repeat adjustments b) and c) if necessary!
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a) Adjust idle speed to 2800 rpm by means of
the /$ = idle-speed adjusting screw
b) /$ = Turn idle-speed adjusting screw
one half turn counterclockwise until cutting
blades no longer run when engine idles,
then add another half turn in same direction.
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The same adjustment as for the former WT 264 must be made for carburetor WT 412.
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