Section 04
ENGINE (DI)
Subsection 05
(TOP END)
04-05-2
SMR2002-062_04_05A.FM
GENERAL
The 2-stroke ROTAX engine rotates counterclock-
wise seen from the rear (PTO flywheel).
The
947 engine
uses reed valves in the crankcase.
The
engine
is also equipped with the RAVE system
(Rotax Adjustable Variable Exhaust).
CAUTION:
No engine components can be inter-
changed between engines.
RAVE System
(Rotax Adjustable Variable Exhaust)
BASIC OPERATION
The RAVE valves change the height of the exhaust
port. The RAVE valve solenoid, which is controlled by
the MPEM, allows a pressure from the air compres-
sor to inflate the bellows and open the RAVE valves.
To open the RAVE valves, the MPEM activates a so-
lenoid which directs the pressure from air compres-
sor to the valves.
1. Pressure from solenoid
1. Solenoid
2. Pressure from air compressor
3. Pressure to RAVE valves
4. Vent to air intake silencer
5. Check valve
6. Vent from counterbalancing shaft oil cavity
To close the RAVE valves, the MPEM deactivates the
solenoid which blocks the air compressor pressure.
The RAVE valves are opened to the atmosphere.
The vent on couterbalancing shaft oil cavity is neces-
sary to prevent pressure buildup in the cavity by the
air compressor piston movement. The check valve al-
lows pressure to escape from the cavity but does not
allow liquid to enter into the cavity.
1
F12D02A
F12D06A
1
2
3
4
5
6
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Содержание GTX 4-TEC 5573 2002
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