Stihl FC 90 - Inlet Needle; Fixed Jet; Pump Diaphragm

23Series 4180 Powerhead
– Remove the metering
diaphragm, b 6.2.4
: Loosen the collar screw (1).
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: Carefully remove the inlet control
lever (1) with spindle.
Reassemble in the reverse
sequence.
– Engage clevis of inlet control
lever in groove on inlet needle.
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– Helical spring must locate in inlet
control lever’s recess.
Make sure the inlet needle and
spring are properly seated.
– Remove the metering
diaphragm, b 6.2.4
: Use a suitable screwdriver to
unscrew the fixed jet (1).
Reassemble in the reverse
sequence.
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Take care not to damage the fixed
jet with the screwdriver during
assembly and installation.
– Remove the carburetor, b 6.2.2
: Take out the screws (1).
: Remove the end cover (2).
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: Remove the spring (1) and spring
retainer (2) from the diaphragm.
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6.2.5 Inlet Needle 6.2.6 Fixed Jet 6.2.7 Pump Diaphragm