Section 06 ENGINE MANAGEMENT (RFI)
Subsection 01 (OVERVIEW)
The Rotax Fuel Injection (RFI) is a semi-direct elec-
tronic fuel injection system.
Fuel is injected into each cylinder through the rear
transfer port. With this design, the injector is not
exposedtohighcombustionpressure,tempera-
ture and contaminants.
NOTE: To reduce emissions, the RFI engine runs
on one cylinder only (MAG side) at idle speed.
This system delivers the following benefits:
– easier cold engine starting (no choke)
– easier hot engine starting
– improved idling
– better throttle response
– better fuel economy
– no fuel valve.
This system has the advantage of optimizing the
engine power, fuel economy and emission con-
trols under all engine operating conditions by man-
aging both the fuel injection duration and ignition
timing.
The Rotax Fuel Injection (RFI) is composed of the
3 following basic systems:
1) air induction
2) fuel delivery
3) electronic management.
AIR INDUCTION
A single throttle body (56 mm) breath through the
air intake silencer to provide a sufficient amount
of air for the engine operation.
F07F1LA
THROTTLE BODY
FUEL DELIVERY
FUEL PUMP
An electric fuel pump provides fuel pressure and
flow rate to the system.
F07F0JA
FUEL PUMP
FUEL PRESSURE REGULATOR
A regulator maintains a constant fuel pressure of
386 - 414 kPa (56 - 60 PSI).
F07F0IA
REGULATOR
FUEL FILTERS
A dual piece fuel filter protects the fuel pump, reg-
ulator and injectors.
298 smr2004-Complete Line Up
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