V.e.s. Adjustment - Polaris INDY TRAIL RMK Service Manual

Variable Exhaust System (V.E.S.)
5. Install V.E.S. assembly onto cylinder and torque
V.E.S. housing bolts to specification. Set spring
adjuster screw to desired specification.
V.E.S. Housing Bolt Torque:
9 Ft lbs (12 Nm)

V.E.S. Adjustment

The RPM at which the exhaust valves open and
close can be tuned by turning the spring adjuster in
or out for the desired valve characteristics.
1. Turning spring adjuster in:
S Creates more spring pressure
S Allows exhaust valve to open at slower rate
S For applications such as drag racing
2. Turning spring adjuster out:
S Creates less spring pressure
S Allows exhaust valve to open at faster rate
S For applications such as trail riding
Riders can fine tune the VES to suit their riding con-
ditions and power delivery characteristics. Base
setting is with adjuster screw flush with housing.
CAUTION: Do not turn spring adjuster too far. The
spring adjuster is turned out to its maximum when
the adjuster is flush with top of housing.
ENGINES
3.49