
MAN-043/B
30
3.12 CHOICE OF THE BEST SPROCKET RATIO
The life of an engine depends on many factors but most of all, upon the speed at
which the engine is operated. If an engine is normally operated at speed higher than
what recommended by the manufacturer, the wears and stress of the various
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
operating limits imposed by the manufacturer.
The operating limit for the “PARILLA X30” engine are respectively:
-14.000 Rpm
-15.500 Rpm
-16.000 Rpm
According to the different engine versions.
ATTENTION:
Never exceed the above limit. No obligation of IAME exists in case the above
limit is exceeded.
In case the user wishes to optimize on the track the sprocket ratio in order to achieve
the best possible performance, without abusing the engine, follow the under shown
recommendations.
The engines are supplied with a 11 teeth sproket (pitch 7.775 mm.), but 10 and 12
teeth sprockets are available as accessories. Table 1 shows the various ratios
between the sprocket on the axle and the engine sprocket given the different axle
sprocket.
Sprocket
ratio
Teeth n° - Engine sprocket
Sprocket
ratio
Teeth n° - Engine sprocket
Teeth n°
Axle sprocket
10 11 12
Teeth n°
Axle sprocket
10 11 12
72 7,20
6,55 6 83 8,30
7,55
6,92
73
7,30 6,64 6,08
84
8,40 7,64 7
74
7,40 6,73 6,17
85
8,50 7,73 7,08
75
7,50 6,82 6,25
86
8,60 7,82 7,17
76
7,60 6,91 6,33
87
8,70 7,91 7,25
77
7,70 7,00 6,42
88
8,80 8,00 7,33
78 7,80
7,09
6,5 89 8,90
8,09
7,42
79
7,90 7,18 6,58
90
9,00 8,18 7,5
80
8,00 7,27 6,67
91
9,10 8,27 7,58
81
8,10 7,36 6,75
92
9,20 8,36 7,67
82
8,20 7,45 6,83
For the operation limit max. of 14.000, 15.500, 16.000 RPM the following table
(Tab. 2a / 2b / 2c) has been prepared.
SUGGESTION:
During the track tests we recommend use of a tachometer recording the max.
obtained engine RPM.
Use spark plug caps with a resistance of 5K
Ω
to avoid the eventual interferences
between the engine ignition and the tachometer and/or telemetry.
Tab.1
Содержание Parilla x30 125cc RL-TaG
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