ST2
71
E
Engine
Twin cylinder, four-stroke, 90° “L” type, longitudinal.
Bore:
94 mm
Stroke:
68 mm
Total displacement:
944 c.c.
Compression ratio:
1:10.2±0.5
Max. power at crankshaft (95/1/EC):
61 kW – 83 HP at 8500 rpm
Max torque at crankshaft (95/1/EC):
84 Nm at 6500 rpm
Max. rotation speed
9000 rpm
Important
Do not exceed specified rotation speed limits under
any running condition.
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.
1
2
3
4
6
5
7
8
fig. 79
Desmodromic timing system
(fig. 79)
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.
