Stihl TS 440 Service Manual page 30

Check air gap with setting gauge 1127 890 6400 and
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adjust if necessary.
Insert spark plug (5) and tighten.
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Attach spark plug boot.
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Place cap (4) in position, insert screw (3) and tighten.
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Fit fan cover (2).
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Insert screws (1) and tighten.
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28 TS 440