Arctic Cat 2010 Crossfire 600, Operator'S Manual, Page: 21 / 60

GENERAL INFORMATION 17
The system consists of an exhaust
valve assembly mounted to the exhaust
side of each cylinder and connected by
adjustable cables to an electronic servo
mounted beneath the hood.

NOTE: The mounting location of the
servo will vary from model to model.
739-152F
At low RPM, the exhaust valves are
held in the DOWN position by return
springs. This gives the engine a “low
port” exhaust design calibrated to pro-
vide maximum low RPM power and
improve fuel economy at trail speeds.
739-152G
At high RPM, the exhaust valves are
raised. This creates a “high port”
exhaust design calibrated to provide
maximum performance at high RPM.
739-152H

NOTE: The RPM ranges will vary
from model to model.

NOTE: If the servomotor cycles
three times and then shuts down,
the exhaust valve cables are not
adjusted correctly. The exhaust
valves may also be sticking.

NOTE: APV cleaning may be
done by the snowmobile owner if
qualified to do so. If the owner
does not feel qualified, take the
snowmobile to an authorized Arc-
tic Cat Snowmobile dealer for this
service. This service is at the dis-
cretion and expense of the snow-
mobile owner.
EXHAUST
CONTROLLED TIMING
(ECT) SYSTEM
This system automatically adjusts the
ignition timing to provide maximum
performance through a variety of oper-
ating conditions. The ECU receives
input on engine RPM (demand) and
exhaust pipe temperature (engine con-
dition) and adjusts the ignition timing
accordingly. This system is not adjust-
able and is maintenance free.
If a system fault is suspected, use an
ohmmeter to check continuity of the
exhaust
pipe temperature sensor
located in the expansion chamber. A
reading of either 0 ohm or infinity indi-
cates a failed sensor.
0737-314

NOTE: A disabled ECT system
WILL NOT cause engine damage;
however, a failed ECT system will
have slower throttle response and
may produce slightly less top-end
performance.