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Table 1
Transmission ratio
No. of teeth of the chain
sprocket on the rear axle
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
Effectivity: 125 MAX/Junior MAX/Mini MAX/Micro MAX
Edition 1/Rev. 0
Number of teeth of the chain sprocket on the crankshaft
11
12
6,55
6,00
6,64
6,08
6,73
6,17
6,82
6,25
6,91
6,33
7,00
6,42
7,09
6,50
7,18
6,58
7,27
6,67
7,36
6,75
7,45
6,83
7,55
6,92
7,64
7,00
7,73
7,08
7,82
7,17
7,91
7,25
8,00
7,33
8,09
7,42
8,18
7,50
8,27
7,58
8,36
7,67
NOTE:
If not absolutely necessary on a certain track try
not to use a chain sprocket with 11 teeth, be-
cause of heavy wear of the plain bearing during
use of this sprocket.
Table 2 shows clearly that in order to reach the maximum engine
speed of 13.500 rpm at a transmission ratio of 6,31 (between 6,20
and 6,40) and an engine speed of 12.000 rpm, the required trans-
mission ratio would lie between 6,98 and 7,20.
Use Table 1 and pick an appropriate combination of chain gears.
For the required transmission ratio between 6,98 and 7,20, the
chain gear matches 12/84, 12/85, 12/86, 13/91 or 13/92 can be
selected.
NOTE:
To simplify changing of the transmission ratio it
is recommended to carry clutch drums with a
prefitted chain sprocket of various numbers of
teeth.
BRP-Powertrain
13
14
5,54
5,14
5,62
5,21
5,69
5,29
5,77
5,36
5,85
5,43
5,92
5,50
6,00
5,57
6,08
5,64
6,15
5,71
6,23
5,79
6,31
5,86
6,38
5,93
6,46
6,00
6,54
6,07
6,62
6,14
6,69
6,21
6,77
6,29
6,85
6,36
6,92
6,43
7,00
6,50
7,08
6,57
15
16
4,80
4,50
4,87
4,56
4,93
4,63
5,00
4,69
5,07
4,75
5,13
4,81
5,20
4,88
5,27
4,94
5,33
5,00
5,40
5,06
5,47
5,13
5,53
5,19
5,60
5,25
5,67
5,31
5,73
5,38
5,80
5,44
5,87
5,50
5,93
5,56
6,00
5,63
6,07
5,69
6,13
5,75
page 2-19
February 01/2014
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