Electric Starter; Exhaust Timing Control; Fuel Pump; Carburetor - Bombardier-Rotax FR 125 MAX FR 125 Junior MAX Installation And Operator's Manual

Operating Instructions FR 125 MAX, FR 125 Junior MAX and FR 125 Mini MAX
To stop the engine, the circuit breaker has to be pressed once again firmly and released (the black
and white ring mark is visible) thus opening the ignition circuit and stopping the engine.

2.5. Electric starter

By pressing the start button the circuit between the battery and electric starter will be closed. The
electric starter drives the starter gear on the crankshaft via an intermediate gear with free
wheeling, until the engine starts to run.

2.6. Exhaust timing control

The engine is equipped with a pneumatic exhaust control which optimizes the performance
characteristics. Variable exhaust timing depending on exhaust pressure will be achieved by a slide
valve in the exhaust port.
Up to a speed of approximately 7500 r.p.m. the exhaust slide valve projects into exhaust port.
With rising engine speed the pressure in the exhaust port increases and withdraws the exhaust
slide valve from the exhaust port at approximately 7500 r.p.m.

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 fuelpump) avoids foreign particles entering the fuel pump
resp. the carburetor,

2.8. Carburetor

The carburetor used is a piston type carburetor with floats. The standard calibration covers nearly
all operating conditions. For extreme operating conditions the jetting of the carburetor has to be
changed to the respective conditions in accordance with this Manual.
At the engine Type FR 125 Mini MAX the performance characteristic gets adapted to the age of
drivers by use of an intake restrictor (Rotax part no.: 660 750).
Installation position see Fig. 12.1
1
40
37
31
30
32 33
20
13
Fig. 12.1
Seite/page 76/108 Ausgabe/edition 09.2003