Ducati 998 User Manual

748
748S
59
E
Engine
Twin cylinder, four-stroke, 90° “L” type, longitudinal.
Bore mm:
88
Stroke mm:
61.5
Total displacement cu.cm.:
748
Compression ratio:
1:11.5±0.5
Max. power at crankshaft (95/1/CE):
72 kW - 97HP at 11000 rpm
Max torque at crankshaft (95/1/CE):
74 Nm at 9000 rpm
Max. rotation speed:
11500 rpm
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.
7
6
6
8
2
1
5
1
3
4
Desmodromic timing system (fig. 44)
1) Opening (or upper) rocker.
2) Opening rocker shim.
3) Split rings.
4) Closing (or lower) rocker shim.
5) Return spring for lower rocker.
6) Closing (or lower) rocker.
7) Camshaft.
8) Valve.
fig. 44
748/748S
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Ducati 998 Specifications

General

Displacement	998 cc
Bore x Stroke	100 x 63.5 mm
Compression Ratio	11.4:1
Transmission	6-speed
Frame	Tubular steel trellis
Front Brakes	2 x 320 mm discs, 4-piston calipers
Seat Height	790 mm (31.1 in)
Engine Type	L-twin, 4-valve per cylinder, Desmodromic
Power	123 hp @ 9, 750 rpm
Front Suspension	Showa 43mm upside-down fork
Rear Suspension	Showa monoshock
Rear Brakes	220 mm disc, 2-piston caliper
Fuel Capacity	17 liters