Exchange Of The Gear Reduction Ratio - Rotax 125 MAX DD2 Installationsanleitung

Gear ratio 2nd gear
Number of teeth of
primary drive gear
32
33
34
35
36
37
38
gear ratio of 2nd gear (cannot be changed)
Note: To facilitate the change of gear ratio it is recommended to carry for each gear ratio a
clutch drum with a pre-assembled primary drive gear and the respective secondary
gear.
Note: To allow easier matching of primary and secondary gears please note: The sum of
the last digits of the teeth number must always be 7 or 17 (35 / 62).
4.3. Exchange of gear reduction ratio
The exchange of the gear ratio seems at first glance to be more complicated than you are used to.
If however you follow the hints below you will notice that the work involved is not much different.
Lift engine side of the kart and place the vehicle at an angle of approx. 80° (this
prevents loss of oil from the gearbox).
Remove the right rear hub with wheel.
Remove the gear cover by unscrewing 6 Allen screws M6x30 (pos. 4).and the 4
Allen screws M8x70 (pos. 30). (Fig. 18)
Note: If the gear cover is difficult to remove, it can be levered off at the separating lugs.
Remove the primary drive gear (pos. 5)
(screwed to clutch drum) and secondary gear
(pos. 6) and fit the gear pair of your choice.
(Fig. 17)
Note: To allow fast exchange of gear ratios we
recommend you to carry in stock various pre-
assembled clutch drums with the respective
primary drive gears.
At re-assembly proceed in reverse sequence. Tighten the
screws to the following torque settings:
M6: 10 Nm (88 lbf. in.)
M8: 22 Nm (195 lbf. in.)
Seite/page 85/100
Operating Instructions 125 MAX DD2
Number of teeth of
gear ratio
secondary drive gear
65
64
63
62
61
60
59
Traditional gear
ratio (at 12.500 r.p.m. and wheel
(in sprocket diameter
sizes)
6,52 14 to 91
6,23 14 to 87
5,95 14 to 83
5,69 14 to 79
5,44 14 to 76
5,21 14 to 73
4,98 15 to 75
3,21
Fig. 17
theoretical max. speed
(in km/h / mile/h)
870 mm /
34,25 in.)
100 / 62
105 / 65
110 / 68
115 / 72
120 / 75
125 / 78
131 / 81
Ausgabe/edition 01/2006