11.10 Choke Shaft With Lever; 11.11 Accelerator Pump - Stihl 4180 Series Service Manual

27
Rotate the throttle shaft (43) and fit the throttle shutter
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(45). The small hole in the throttle shutter (45) faces
the adjusting screws.
Insert and tighten down the screw (27).
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11.10 Choke Shaft with Lever

Removing
Remove the screw (27) from the choke shutter (26)
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and take out the shutter.
Remove the choke knob (24), @ 11.4
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Remove the E-clip (21).
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Pull out the choke shaft (13).
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Remove the sealing ring (19), washer (18) and
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spring (17).
Remove the E-clip (15).
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Remove the lever (16).
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Installing
20
18
17
19
16
15
Fit the lever (16) on the choke shaft (20) and then the
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E-clip (15).
Push the spring (17) onto the choke shaft (20) so that
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it is hooked onto the lever (16) (arrow).
Push the washer (18) and sealing ring (19) onto the
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choke shaft (20) and up to the spring (17).
Fit the choke shaft (20) in the carburetor so that the
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spring (17) engages the hole in the carburetor body
(arrow) and the lever (arrow).
Fit the E-clip (21).
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Position the choke shutter (26) on the choke shaft
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(13) so that the digit on the shutter is visible and at the
same side as the choke knob (24).
30
45
Insert and tighten down the screw (27).
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Fit the choke knob (24), @ 11.4.
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11.11 Accelerator Pump

Removing
39
Remove the throttle shaft (43), @ 11.9.
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Use angled scriber to push out the strainer (39).
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Take out the pump piston (41) with sealing ring and
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spring (40), and inspect for damage, replace if
necessary.
Installing
Fit spring (40) and pump piston (41) with a new
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sealing ring (38) in the bore.
Push a new strainer (39) into the bore.
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Series 4180 Powerhead