Ducati MULTISTRADA 1200S ABS 2015 Workshop Manual page 1015

- Measure the diameter of the valve stem at various points along the section that runs in the valve guide.
- Check the valve stem for buckling. Place it on a "V" reference and measure deformation with a dial gauge.
Service limit: 0.053 mm.
Check the valve stem for buckling. Place the valve on a "V" reference block, set a dial gauge perpendicular to head
and measure concentricity of valve face at 45°:
- nominal concentricity: 0.01 mm;
- service level: 0.03 mm.
Use Prussian blue or a mixture of minium and oil to check that the contact surface (W) between valve and seat is
1.4 to 1.6 mm (1.05 to 1.35 mm when new).
Grind the seat if the dimension measured is greater than the above limit.