Polaris 2003 Pro X Service Manual page 40

ENGINE
Variable Exhaust System (V.E.S.) - 440 Pro X
440 Pro X Variable Exhaust System:
The exhaust valve system on the new 440 Pro X is electronically controlled by solenoids. Pressure from
the cylinders is routed through the solenoids to the atmosphere. During this time the exhaust valves are
down. When the CDI senses 6700 RPM, it triggers the solenoids to shut off the bypassed air going to the
atmosphere. Pressure then builds inside the exhaust valve bellows, causing the valves to fully open.
When RPM drops below 6700, the solenoids open to allow air to bypass through to atmosphere and the
exhaust valves close.
Below 6700 RPM
CDI Box
Wire
Solenoid
Open
Hose
Balance Tube
T-Fitting
Inlet Hole
Spring
from Cylinder
Bellows
Outlet Hole
Exhaust
Valve
2.8
Exhaust Valves Closed
Yellow Wire to
Wiring Harness
Wire
Solenoid
Open
Hose
T-Fitting
Inlet Hole
Spring
from Cylinder
Bellows
Exhaust
Valve
Above 6700 RPM
Exhaust Valves Fully Open
Yellow Wire to
Wiring Harness
CDI Box
Wire
Solenoid
Closed
Hose
Balance Tube
T-Fitting
Inlet Hole
from Cylinder
Spring
Bellows
Exhaust
Outlet Hole
Valve
Wire
Solenoid
Closed
Hose
T-Fitting
Inlet Hole
from Cylinder
Spring
Bellows
Exhaust
Valve