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Operator's Manual ROTAX 125 MAX evo, Junior MAX evo, Mini MAX evo, Micro MAX evo
2.5. Electric starter
By pressing the start button, the circuit between the battery and electric starter will be closed by a
relay. The electric starter drives the starter gear on the crankshaft via an intermediate gear with
free-wheeling, until the engine starts to run. An automatic switch reset from "START" to "ON" is
integrated.
2.6. Electro-pneumatical exhaust timing control (125 MAX only)
The engine type 125 MAX evo is equipped with an electro-pneumatic exhaust control. The ERAVE
(Electronic ROTAX Adjustable Variable Exhaust) system is controlled by an electro-pneumatic
valve via the ECU. The vacuum required is provided by the engine crankcase.
At engine stop, the exhaust valve is in idle mode and therefore in the open position. With the
engine running, it closes or opens the electro-pneumatic valve of the exhaust, depending on the
speed and therefore, it provides optimum performance characteristics.
2.7. Fuel pump
The fuel pump is actuated by the pulsating pressure changes in the crankcase and the pump
transfers the fuel from the fuel tank to the carburetor.
An inline fuel filter (between fuel tank and fuel pump) keeps foreign particles from entering the fuel
pump or the carburetor, respectively.
2.8. Carburetor
The carburetor (DELL'ORTO VHSB 34) is a slide type carburetor with float system. The standard
main jet is suitable for almost all operating conditions. For extreme operating conditions, the main
jet size must be adjusted to the actual conditions according to this manual.
2.9. Intake silencer
The intake silencer incorporates an air filter to clean the intake air. The intake silencer has been
designed for optimum reduction of the air intake noise level and represents a tuned system with
the engine.
The air filter consists of several layers and has been optimized in the area of air passage and filter
to work more effectively. If soiled or during engine maintenance work, clean the filter with
biodegradable products.
2.10. Exhaust system
The exhaust system is designed as a resonance system with an after-muffler and represents a
tuned system with engine.
Page 36/58
Edition 09/2016
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