22
Arctic Power Valve
(APV) System (800 cc
Models)
This RPM controlled servomotor (servo)
actuated system adjusts the size of the
exhaust ports to provide peak perfor-
mance throughout the RPM range.
The system consists of an exhaust valve
assembly mounted to the exhaust side of
each cylinder and connected by adjust-
able 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 provide
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 Arctic Cat Snowmobile
dealer for this service. This service
is at the discretion and expense of
the snowmobile owner.
Exhaust Controlled
Timing (ECT) System
(800 cc Models)
This system automatically adjusts the
ignition timing to provide maximum per-
formance through a variety of operating
conditions. The ECU receives input on
engine RPM (demand) and exhaust pipe
temperature (engine condition) and
adjusts the ignition timing accordingly.
This system is not adjustable and is main-
tenance free.
If a system fault is suspected, use an ohm-
meter to check continuity of the exhaust
pipe temperature sensor located in the
expansion chamber. A reading of either 0
ohm or infinity indicates a failed sensor.
CAUTION
The recommended engine oil to use
is either Arctic Cat APV Synthetic 2-
Cycle Oil or Formula SS Semi-Syn-
thetic Oil (see Gasoline-Oil - Recom-
mended Injection Oil sub-section in
this section). Any substitute may
cause an APV malfunction.
Summary of Contents for M 1100 Turbo
Page 7: ...3 Snowmobile Safety Rules...
Page 64: ...60 NOTES...