Engine Tuning; Carburetor Calibration - Rotax 125 MAX Installation Instructions And Operators Manual

4) Engine tuning

4.1) Carburetor calibration

General
Table
Main jet
- 5 °C / + 23 °F
+ 5 °C / + 41 °F
+ 15 °C / + 59 °F
+ 25 °C / + 77 °F
+ 35 °C / + 95 °F
Effectivity: 125 MAX/Junior MAX/Mini MAX/Micro MAX
Edition 1/Rev. 0
The standard carburetor calibration is for an ambient temperature
of 25 °C / 77 °F and 400 m / 1300 ft above sea level. At operation
with different temperatures and altitudes, the main jet of the car-
buretor has to be changed in accordance with the following table,
to optimize engine performance.
NOTE: Valid as from engine no. 536536 (jetting of car-
buretor R 9796).
Sea level
Sea level
400 m/
0 m/0 ft
1300 ft
178 175
175 172
172 170
170 168
168 165
CAUTION
WARNUNG
CAUTION
WARNUNG
NOTE: If under the existing conditions a larger main jet
than specified in the table is used, the engine
might only reach 90-95 % of it's maximum
speed.
NOTE: At engine operation with ambient temperatures
below 10 °C / 50 °F make sure not to demand
full power before the coolant temperature has
reached 45 °C / 113 °F.
BRP-Powertrain
Sea level
800 m/
2600 ft
172
170
168
165
162
A smaller main jet than shown in the table
could lead to piston seizure under the exis-
ting conditions
Misfiring in the exhaust system between
10.000 and 12.000 rpm indicates that the
mixture is too lean (the fuel-air mixture
cannot be ignited by the ignition spark).
Sea level Sea level
1200 m/ 1600 m/
3900 ft 5200 ft
170 168
168 165
165 162
162 160
160 158
page 2-13
February 01/2014