Ducati SCRAMBLER 800 Workshop Manual page 619

Fix manifold (2) to the vertical head by starting screws (12) and tightening them starting from one of the
two following the procedure below:
The first one to 6 Nm ± 10%;
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The second one to 24 ± 10% Nm;
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Then again the first one to 24 ± 10% Nm.
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Insert the primary exhaust pipe (3) in manifold (2) and block it with spring (8).