Monster 659 - Performance and Spark Plug Data

115
E
Engine
Longitudinal 90º “L” twin cylinder, four-stroke.
Bore (mm):
88
Stroke (mm):
54.2
Total displacement cm
3
:
656
Compression ratio:
10.2 ±0.5:1
Max power at crankshaft (95/1/EC):
38 kW/- 52 HP at 8,500 rpm
Max torque at crankshaft (95/1/EC):
7.8 kgm - 46.5 Nm at 7,500 rpm.
Maximum rpm:
9,500 rpm.
Timing system
DESMODROMIC (type) with two valves per cylinder,
operated by four rocker arms (2 opening rocker arms and 2
closing rocker arms) and one overhead camshaft. It is
operated by the crankshaft through spur gears, belt rollers
and toothed belts.
Desmodromic timing system
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.
1
2
3
4
6
5
7
8
fig. 114