Electric Starter; Exhaust Timing Control; Fuel Pump; Carburetor - Rotax 125 MAX Installation Instructions And Operators Manual

2.5) Electric starter

2.6) Exhaust timing control (125 MAX only)

2.7) Fuel pump

2.8) Carburetor

Effectivity: 125 MAX/Junior MAX/Mini MAX/Micro MAX
Edition 1/Rev. 0
By pressing the start button the circuit between the battery and the
electric starter will be closed. The electric starter drives the starter
gear on the crankshaft via an intermediate gear with free whee-
ling, until the engine starts to run.
The engine is equipped with a pneumatic exhaust control which
optimizes the performance characteristics. Variable exhaust ti-
ming depending on exhaust pressure will be achieved by a slide
valve in the exhaust port.
Up to a speed of approximately 7.500 rpm the exhaust slide valve
projects into exhaust port.
With rising engine speed the pressure in the exhaust port increa-
ses and withdraws the exhaust slide valve from the exhaust port
at approximately 7.500 rpm.
The fuel pump is driven 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) avoids for-
eign particles entering the fuel pump or the carburetor.
See Fig. 1.
The carburetor used is a piston type carburetor with floats. The
standard calibration covers nearly all operating conditions. For ex-
treme operating conditions the jetting of the carburetor has to be
changed to the respective conditions in accordance with this Ma-
nual.
At the engine Type 125 Micro MAX the performance characteris-
tic gets adapted to the age of drivers by use of an intake restrictor
(Rotax part no.: 267535 or 267530).
BRP-Powertrain
page 2-5
February 01/2014