Ducati Monster 695 User Manual page 424

Cylinder / piston assy
Clean the crown of the piston and the piston ring grooves from carbon deposits.
Inspect the dimensions of the piston carefully: there must be no signs of shrinkage, scoring, cracks or damage.
Measure piston diameter (P) 10 mm above skirt base, at right angles to the axis of the gudgeon pin.
Pistons must always be changed in pairs.
Piston-cylinder clearance
Pistons are marked with their class (a letter printed on the piston crown).
Always match cylinder and piston from the same class.
For clearance values refer to Sect. C 1.1.
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