Adjustment Of Carburetor Main Jets To Ambient Conditions - Rotax RM1 Operator's Manual

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
- 5° Celsius
+ 5° Celsius
+15° Celsius
+25° Celsius
+35° Celsius
Chart 1A
Hauptdüse
Mainjet
- 41° Fahrenheit
+ 41° Fahrenheit
+ 59° Fahrenheit
+ 77° Fahrenheit
+ 95° Fahrenheit
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).
Seite/page 92/132
Operator`s Manual RM1
Meereshöhe Meereshöhe
Sea level
0 Meter
195
192
190
188
185
Meereshöhe Meereshöhe
Sea level
0 Feet
195
192
190
188
185
ROTAX KART RM1
Meereshöhe
Sea level
400 Meter 800 Meter
192
190
180
185
182
Meereshöhe
Sea level
1300 Feet 2600 Feet
192
190
180
185
182
Meereshöhe
Sea level Sea level
1200 Meter
190
187
185
182
178
Meereshöhe
Sea level Sea level
3900 Feet
190
187
185
182
178
Ausgabe/Edition 01/2006
188
185
182
178
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188
185
182
178
175