Operator`s Manual RM1
Seite/page 92/132 ROTAX KART RM1 Ausgabe/Edition 01/2006
4.4. Adjustment of carburetor main jets to ambient conditions
The carburetor is set in serial production with a jetting (main jet 185) for ambient temperature of
25°C / 77°F and an altitude of 400 m / 1300 ft above sea level. If the engine is operated at other
ambient temperatures and altitudes, change the carburetor main jet as per Chart 1A or 1B to
optimize the engine performance.
For details see Chapter Carburetor adjustment
Hauptdüse
Mainjet
Meereshöhe
Sea level
0 Meter
Meereshöhe
Sea level
400 Meter
Meereshöhe
Sea level
800 Meter
Meereshöhe
Sea level
1200 Meter
- 5° Celsius
195 192 190 188
+ 5° Celsius
192 190 187 185
+15° Celsius
190 180 185 182
+25° Celsius
188
185
182 178
+35° Celsius
185 182 178 175
Chart 1A
Hauptdüse
Mainjet
Meereshöhe
Sea level
0 Feet
Meereshöhe
Sea level
1300 Feet
Meereshöhe
Sea level
2600 Feet
Meereshöhe
Sea level
3900 Feet
- 41° Fahrenheit
195 192 190 188
+ 41° Fahrenheit
192 190 187 185
+ 59° Fahrenheit
190 180 185 182
+ 77° Fahrenheit
188
185
182 178
+ 95° Fahrenheit
185 182 178 175
Chart 1B
Attention: If for the prevailing operating conditions a smaller main jet is used than
mentioned in Chart 1A or 1B, this can cause piston seizure.
Note: If you wish to operate the vehicle in a zone where the ambient temperature or the
altitude is outside the Chart values, contact your distribution partner or a ROTAX
Service Center.
Note: When operating the engine at temperatures below 10° C / 50° F take particular not
to demand the full potential of the engine before the minimum coolant temperature
of 35 ° C / 95° F is reached or before the signal “COLD” has extinguished on the
multi-functional display.
Note: If you want to use your vehicle on different circuits at various ambient temperatures
and altitudes – without changing the main jet – choose a main jet according to the
lowest temperature and lowest sea level.
Note: In case of doubt always start with the richer jetting (bigger main jet).
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