Engine; Timing System - Ducati 620 SPORT Owner's Manual

Engine

Twin cylinder, four-stroke, 90° "L" type, longitudinal.
Bore:
80 mm.
Stroke:
61.5 mm.
Total displacement:
618 c. c..
Compression ratio ±0.5:1:
E
10.5.
Max. power at crankshaft (95/1/CE):
45 kW – 61 HP at 8750 rpm.
Max torque at crankshaft (95/1/CE):
54 Nm-5.5 Kgm at 6500 rpm.
Derated version
Max. power at crankshaft (95/1/CE):
24 kW – 32.6 HP at 9500 rpm.
Max torque at crankshaft (95/1/CE):
42 Nm-4.3 Kgm at 3500 rpm.
Important
Do not exceed specified rotation speed limits under
any running condition.
66

Timing system

Desmodromic (type) with two valves per cylinder,
operated by four rockers (2 opening rockers and 2 closing
rockers) and an overhead camshaft. It is operated by the
crankshaft through spur gears, belt rollers and toothed
belts.
Desmodromic timing system (fig. 70)
1) Opening (or upper) rocker arm.
2) Opening rocker arm shim.
3) Split rings.
4) Closing (or lower) rocker arm shim.
5) Return spring for lower rocker arm.
6) Closing (or lower) rocker arm.
7) Camshaft.
8) Valve.
1
2
3
4
6
5
7
8
fig. 70