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Engine
Twin cylinder, four-stroke, 90° "L" type, longitudinal.
Bore:
90 (749/749S/749Dark)
Stroke:
58.8 (749/749S/749Dark)
Total displacement cm
748 (749/749S/749Dark)
Compression ratio:
11.7 ± 0.5:1 (749/749Dark);
E
12.3 ± 0.5:1(749S).
Max power at crankshaft (95/1/EC), kW/CV:
76/103 at 10,000 rpm (749/749Dark);
81/110 at 10,500 rpm (749S);
Max torque at crankshaft (95/1/EC):
77 Nm at 8,500 rpm (749/749Dark);
78 Nm at 8,500 rpm (749S);
Max rotation speed, rpm:
11.500
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.
88
3
:
Desmodromic timing system (fig. 82)
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
5
4
fig. 82
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