Section 04
ENGINE (2-STROKE)
Subsection 05
(TOP END)
04-05-4
SMR2003-010_04_05A.FM
GENERAL
The 2-stroke ROTAX engine rotates counterclock-
wise seen from the rear (PTO flywheel).
The
717
and
787 RFI engines
have a rotary valve
to control opening and closing of the intake. The
947 DI engines
uses reed valves in the crankcase.
The
787 RFI
and
947 DI engines
are 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 either positive crankcase
pressure (
787 RFI engines
) or a pressure from the
air compressor (
947 DI engines
) to inflate the bel-
lows and open the RAVE valves.
Carburetor-Equipped Engines
On top of the RAVE, there is a red plastic adjust-
ment knob. Turning the adjustment in or out
changes the preload on the return spring which, in
turn, will change the RPM at which the RAVE valve
opens and closes. On
947 DI engines
, the spring
preload does not have a significant effect on the
valve operation.
787 RFI Engines
On these engines, the RAVE valves are controlled
by the Multi-Purpose Electronic Module (MPEM).
To open the RAVE valves, the MPEM activates a
solenoid which directs the positive pressure from
engine crankcase to the valves.
1. Solenoid
2. Pressure hose from crankcase
3. To atmospheric pressure
NOTE:
A check valve on the pressure line elimi-
nates the negative pressure from the crankcase.
To close the RAVE valves, the MPEM deactivates
the solenoid which blocks the crankcase positive
pressure. The RAVE valves are opened to the at-
mosphere.
RAVE VALVE OPENED
1. Pulse from crankcase
2. Check valve
3. Positive pressure to solenoid
4. Solenoid activated
5. Positive crankcase pressure to RAVE valves
2
F06D3BA
1
3
3
F06D16A
2
1
4
5
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Содержание 2003 GTI LE RFI
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Страница 775: ...F00Z0F 2003 GTX 4 TEC MODEL WARNING www SeaDooManuals net ...
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Страница 777: ...F00Z0B 2003 GTX 4 TEC AND GTX 4 TEC SUPERCHARGED MODELS WARNING www SeaDooManuals net ...
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