Akrapovic Vespa Primavera 125ie Mode D'emploi page 9

3. Hand tighten the Akrapovič header onto the exhaust port, using original nuts (F 07).
INSTALLATION TIP: use new stock exhaust port gasket.
IMPORTANT: do not fully tighten the nuts yet! Hand tighten them only!
Install the lambda sensor into the link pipe (F 08).
4.
IMPORTANT: make sure not to damage the lambda sensor's electrical lead during this procedure!
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39Nm
29ftlb
F 07
F 08