Op
erator’s Manual ROTAX 125 MAX evo, Junior MAX evo, Mini MAX evo, Micro MAX evo
Pa
ge 35/58
Ed
ition 09/2016
1. De
sign of the ROTAX engine types 125 MAX evo, Junior MAX evo, Mini MAX evo and
Micro MAX evo
2.1. Single-cylinder two-stroke engine, reed valve controlled, and 125 cm
3
displacement
2.2. Cooling circuit
2.3. Balance shaft
2.4. Ignition unit
2.5. Electric starter
2.6. Electro-pneumatically exhaust timing control (125 MAX evo only)
2.7. Fuel pump
2.8. Carburetor
2.9. Intake silencer
2.10. Exhaust system
2. Techni
cal description of the ROTAX engine types 125 MAX evo, Junior MAX evo, Mini
MAX evo and Micro MAX evo
2.1. Type of engine
Single-cylinder two-stroke engine with reed valve controlled inlet. The proper mixture lubrication is
achieved by adding oil to the gasoline in a specified mixing ratio.
2.
2. Cooling circuit
The coolant is pumped from the radiator to the water pump, which is driven by the clutch shaft. The
water pump conveys the coolant through the cylinder and the cylinder head back to the radiator.
The cooling circuit is equipped with a thermostat (opening point 45 °C / 113 °F). It assures that the
engine reaches its operating temperature quickly and keeps it at a relatively constant level.
The thermostat is integrated in the cylinder head cover.
2.
3. Balance shaft
The balance shaft rotates counter-wise to the crankshaft to reduce engine vibration.
2.
4. Ignition unit
The control of the ignition system is exercised by the ECU (Engine Control Unit). To calculate the
ignition timing, an engine speed sensor is needed, which is installed on the bottom of the engine
housing. There is no manual adjustment of the ignition system necessary and/or possible.
If the power button is pressed once, the ignition is activated and the button lights up. To start the
engine, it only needs to be pressed once again. To turn off the engine as well as the ignition,
proceed in reverse order.
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