Selection Of The Transmission Ratio - 125 Max - Rotax 125 MAX Installation Instructions And Operators Manual

4.2) Selection of the transmission ratio - 125 MAX

General
Graphic
Effectivity: 125 MAX/Junior MAX/Mini MAX/Micro MAX
Edition 1/Rev. 0
1
1 -
AIR SCREW AND PILOT JET
2 - TYPE AND POSITION OF JET NEEDLE
3 - TYPE OF NEEDLE JET
4 - MAINJET
Fig. 5
CAUTION
WARNUNG
NOTE: The maximum engine speed in Kart operation
will be controlled by the ignition unit. At engine
speeds above 13.800 rpm the ignition timing
will be controlled so, that the engine perfor-
mance will drop significantly (see
Because of the special tuning used, the engine performance is
very good in the speed range from 6.000 to 12.000 rpm.
Peak performance will be achieved at 11.500 rpm, but over-rev-
ving of up to 14.000 rpm is permitted.
The power available for acceleration is in the engine speed range
between 6.000 rpm and 12.000 rpm higher than between 12.000
and 13.500 rpm.
Therefore it is not always the best to use this high speed range
(high top speed on straights) and to leave the higher acceleration
potential (after narrow bends) at the lower speed range untapped.
This is just a remark making it obvious that the best possible tu-
ning can only be achieved with an exact knowledge of the race
track.
BRP-Powertrain
2 3
Never run the engine without load. By revving
the engine without load, speeds above
14.000 rpm can be reached and this exces-
sive engine speed will drastically shorten the
life span of some components (conrod,
conrod bearings, etc).
FULL THROTTLE
VOLLGAS
3/4
1/2
1/4
1/8
LEERLAUF
IDLE
4
K00264
Fig. 6).
page 2-17
February 01/2014