MAN-072
22
INDICATIVE SPARK PLUG COMPARISON TABLE
BASED ON THERMAL DEGREE
HOT
BOSCH
NGK
CHAMPION
WO8CS
BR9EG
N54R
WO7CS
BR10EG
N52R
WO6CS
BR11EG
COLD
3.12-
CHOICE OF THE SPROCKETS RATIO
The life of an engine depends upon many factors but most of all upon the speed at which
the engine is operated. If an engine is normally operated at speeds higher than what
recommended by the manufacturer, the wear and stress of the different components (con-
rods, roller cages, bearings etc.) will be such as to drastically reduce the life of the
engine itself. It is therefore extremely important that the user respects the operating limits
imposed by the manufacturer.
The operating limit for the Reedjet 100cc AUS engine is 15.000 RPM.
ATTENTION:
Never exceed the above limit. No obligation of IAME exists in case the above limit is
exceed.
In case the user wishes to optimize the sprocket ratio on the track, in order to achieve the
best possible performance and without overloading the engine, follow the under shown
recommendations.
The engines are supplied with a 10,11,12 or 13 teeth sprocket (pitch: 7.775mm).
Table 1 shows the various ratios between the sprocket on the axle and the engine
sprocket given the different axle sprockets.
Tab.1
Sprocket Ratio
Teeth n° - Engine sprocket
Sprocket Ratio
Teeth n° - Engine sprocket
Starting Gear
10
11
12
13
Teeth n°
Axle Gear
10
11
12
13
72
7,2
6,55
6,00
5,54
83
8,3
7,55
6,92
6,38
73
7,3
6,64
6,08
5,62
84
8,4
7,64
7,00
6,46
74
7,4
6,73
6,17
5,69
85
8,5
7,73
7,08
6,54
75
7,5
6,82
6,25
5,77
86
8,6
7,82
7,17
6,62
76
7,6
6,91
6,33
5,85
87
8,7
7,91
7,25
6,69
77
7,7
7,00
6,42
5,92
88
8,8
8,00
7,33
6,77
78
7,8
7,09
6,50
6,00
89
8,9
8,09
7,42
6,85
79
7,9
7,18
6,58
6,08
90
9
8,18
7,50
6,92
80
8
7,27
6,67
6,15
91
9,1
8,27
7,58
7,00
81
8,1
7,36
6,75
6,23
92
9,2
8,36
7,67
7,08
82
8,2
7,45
6,83
6,31
