The gap setting would be 0.020".
STIHL 4144 Trimmer Service Kit, Fits Trimmer Models FS 40, FS 56, FS 70, KM 56 and HT 56

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- For STIHL FC 56 edger, FC 70 curved shaft edger, FS 40 trimmer, FS 56 trimmer, FS 70 straight shaft trimmer, HT 56 pole pruner, KM 56 Kombi motor.
- Easy replacement of parts with the combination socket tool of your finished machine.
- With air filter, spark plug and fuel filter.
- To support the longevity of your machine through proactive maintenance.
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