Ducati Scrambler Valve Measurement And Adjustment User Manual page 5

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Tighten the retaining bolt snug with a 13 mm wrench.
With the sparkplugs removed rotate the engine turning tool counter clockwise (from
the left side of the engine) until the horizontal cylinder comes to the top if its stroke:
Top Dead Center (TDC).
TDC occurs at the top of the compression stroke. You can feel air rushing out of the
cylinder as the piston comes up on the compression stroke. The magnet gently
inserted into the cylinder will give a visual indication when the piston has reached
the top of the stroke. (The handle of the engine turning tool will be in line with the
horizontal cylinder)
IMPORTANT: With the horizontal cylinder at TDC, the engine is in the "HOME" position.
The HOME position is the condition where all of the timing marks will align (useful for
belt changes).
The horizontal cylinder is also in the "rest" position (no tension on the valves). The
"rest" position is the correct position to measure the valve clearances. Verify the rest
position by spinning the opening shim with your finger.
Working from vehicle left-hand side, loosen the two
screws (3) and remove plug (1) from generator
cover (2)
Once the
plug is
removed
from the
generator
cover, install
the engine
turning tool,
making sure the tangs on the tool engage the
indents on the crank shaft (4).
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