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Service on 97000 km.
Old spark plug have 40000km.
8.40 Valve adjust with the key unscrew the nut and with a screwdriver a proceed little spacing (max half turn). Screw a nut with flare nut wrench key, Eazy
My Stelvio after 60000 km don't need adjust valve, just check :)
Newer Stelvio maybe have different gap between inlet and outlet valve. Check Manual!