Engine Tuning; Carburetor Calibration - Rotax Fr 125 Max Betriebsanleitung

4. Engine tuning

4.1. Carburetor calibration

The standard carburetor calibration is for an ambient temperature of 25° C and 400m above sea
level. At operation with different temperatures and altitudes, the main jet of the carburetor has to
be changed in accordance with Table 1, to optimize engine performance.
Attention: Valid as from engine No. 536 536 (jetting of carburetor R9796).
Main jet
- 5°
+ 5° C
+15° C
+25° C
+35° C
Table 1
Attention: A smaller main jet than shown in the table could lead to piston seizure under the
existing conditions.
Attention: Misfiring in the exhaust system between 10000 and 12000 r.p.m. indicates that the
mixture is too lean (the fuel-air mixture cannot be ignited by the ignition spark).
Attention: If under the existing conditions a larger main jet as specified in Table 1 is used, the
engine might only reach a maximum speed of 12000 to 12500 r.p.m. (see diagram
1).
Seite/page 64/80
Operating Instructions FR 125 MAX
altitude
0 Meters 400 Meters
178
175
172
170
168
FR 125 MAX
altitude altitude
800 Meters
175
172
170
168
165
altitude
1200 Meters
172 170
170 168
168 165
165 162
162 160
Ausgabe/edition 07/99