Engine; Timing System - Ducati 999S Owner's Manual

Engine

Twin cylinder, four-stroke, 90° "L" type, longitudinal.
Bore:
100 mm (999/999S)
Stroke:
63.5 mm (999/999S)
Total displacement:
998 cu.cm. (999/999S)
Compression ratio:
1:11.4±0.5 (999/999S)
Max. power at crankshaft (95/1/EC):
91 kW - 124 HP at 9500 rpm (999)
100 kW - 136 HP at 9750 rpm (999S)
Max torque at crankshaft (95/1/EC):
102 Nm at 8000 rpm (999)
106 Nm at 8000 rpm (999S)
Max. rotation speed:
11500 rpm (999/999S)
Important
Do not exceed specified rotation speed limits
under any running condition.

Timing system

Desmodromic (type) with four valves per cylinder,
operated by eight rocker arms (4 opening rockers and 4
closing rockers) and two overhead camshafts. It is
operated by the crankshaft through spur gears, belt
rollers and toothed belts.
Desmodromic timing system (fig. 80)
1) Opening (or upper) rocker.
2) Opening rocker shim.
3) Closing (or lower) rocker shim.
4) Return spring for lower rocker.
5) Closing (or lower) rocker.
6) Camshaft.
7) Valve.
6
1 2 3
7
E
5 4
fig. 80
87