Design Of The Rotax Engine 125 Max Dd2 Evo; Technical Description Of The Rotax Engine Type 125 Max Dd2 Evo; Type Of Engine; Cooling Circuit - BRP ROTAX 125 MAX DD2 evo Installation Instructions And Operators Manual

1. Design of the ROTAX engine 125 MAX DD2 evo

2.1. Single-cylinder two-stroke engine, reed valve controlled, 125 cm
2.2.

Cooling circuit

2.3.

Balance gear

2.4.

Ignition unit

2.5. Electric starter
2.6. Electro-pneumatically controlled exhaust timing
2.7. Intake silencer
2.8. Exhaust system
2.9. Gear box
2.10. Electronic Shifting Assistant (ESA)
2.11. Fuel pump
2.12. Carburetor
2.13. Centrifugal clutch
2.14. Overload clutch

2. Technical description of the ROTAX engine Type 125 MAX DD2 evo

2.1.

Type of engine

Single-cylinder two-stroke engine with reed valve controlled inlet. Proper mixture lubrication is
achieved by adding oil to the gasoline in a specified mixing ratio.
The power transmission to the rear axle takes place via a manually shiftable integrated 2-speed
gearbox.
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 gear
The balance gear is mounted on the primary shaft and 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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Operator's Manual 125 MAX DD2 evo
3
displacement
Edition 09/2016