Ducati SUPERBIKE 848 MY 2008 Manual page 497

Cylinder head assemblies: valves - rocker arms
Checking the rocker arms
Check for signs of wear, grooves or chrome flaking off.
Check the condition of rocker arm bore and shaft.
Assembly clearance: 0.025 to 0.049 mm.
Wear limit: 0.08 mm.
Opening and closing shims - Springs
Check the condition of the contact surfaces of the valve opening and closing shims: there must be no signs of wear.
Check the condition of the closing rocker arm return springs.
Check for cracking, distortion, or loss of elasticity.
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