Operator`s Manual RM1
Seite/page 123/132 ROTAX KART RM1 Ausgabe/Edition 01/2006
The acceleration potential between 9.200 and 12.200 r.p.m. is essentially higher than between
12.200 and 13.600 r.p.m. Therefore it does not always make sense to use this r.p.m. range (high
top speed on a straight) and to leave the acceleration potential of the lower r.p.m. range (out of
sharp corners) unused.
This should only be a hint. The optimum choice can only be found at exact knowledge of the race
track.
For an approach or optimization of the reduction gear ratio the Charts 2 and 3 should be helpful.
The optimization procedure for the reduction gear ratio for a new race track is explained step by
step by the following example:
¨ Start with the standard gear ratio (35 : 62, equivalent to 12 / 90 at 1
st
gear and 14/79 at 2
nd
gear).
Now you must decide on the following criteria whether a shorter or longer gear ratio is necessary:
IF YES:
¨ Chose the next longer gear ratio (36 : 61 equivalent to 12 / 87 in 1
st
gear and 14 / 76 in 2
nd
gear).
IF NO:
¨ Chose the next shorter gear ratio (34 : 63 equivalent to 11 / 87 in 1
st
gear and 14 / 83 in 2
nd
gear).
If these gear ratios are still not sufficient, try the next shorter or next longer gear ratio.
Note: When using short gear ratios it may happen that the response behaviour of the
engine in 1
st
gear is aggressive and the vehicle handling becomes difficult. For a
good lap time often a longer gear ratio is helpful to achieve reasonable performance
behaviour.
Note: To help with the choice of adequate gear ratios you will find below two Charts in
which the traditional gear ratios and the top speeds in [kmh] that can be reached in
the respective gear at an engine speed of 12.500 r.p.m.
Does the engine reach 12.500 r.p.m in 2
nd
gear at the end of
the longest straight?
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