Arctic Cat Sno Pro 120, Service Manual

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TZ060A
13. Connect the air bypass hose and the air bypass control
valve hose to the intake pipe and secure with the clamps.
743-983A
14. Install the hose from the waste gate control valve to
the elbow fitting of the turbocharger and secure with
the clamp.
TZ086B
15. Connect the air silencer hose to the turbocharger and
secure with the clamp; then secure the air silencer to
the right-side upper frame with the cap screw.
743-983B
16. Position the intercooler into the grommets of the
mounting bracket; then connect the intercooler hoses
to the turbocharger and to the intake plenum. Tighten
all hose clamps securely.
17. Start the engine and allow the engine to idle for at
least two minutes before increasing RPM to allow
for proper lubrication of the turbocharger shaft and
bearings.
18. After running the engine, check the oil and coolant
levels.

NOTE: If adding coolant is required, bleed the cool-
ing system (see appropriate Liquid Cooling System
in this section).
Arctic Power Valve (APV)
System (800 cc)
The Arctic Power Valve (APV) System adjusts the size of
the exhaust ports to produce maximum horsepower on
the top end while providing excellent low end power and
increased touring fuel economy.
THEORY
Two-cycle engines and their exhaust systems are
designed to produce maximum horsepower in a given
RPM range. This RPM range will change according to
how high (or low) the exhaust port is in relation to the
cylinder. Engines designed for racing have a “high port”
exhaust system and will produce more horsepower at
higher RPM but only with the loss of low end power and
overall fuel economy. “Low port” engines will produce
maximum horsepower in the low RPM ranges and pro-
vide good mid-range fuel economy, but they sacrifice top
end performance.
The APV system does not increase engine horsepower,
but it does allow the engine to be designed for maximum
top end horsepower without the losses associated with a
“high port” exhaust system.