118
9. Apply a low-temperature grease to the friction plate.
Place the pawl activator into position on the friction
plate making sure the arms of the activator are prop-
erly positioned to the pawl.
10. Place the friction plate into position allowing it to
rest on the friction plate spring; then install the cap
screw w/washer (coated with blue Loctite #243) and
thread the cap screw in until it contacts the friction
plate.
11. Press down on the friction plate and tighten the cap
screw to 15 ft-lb.
12. With 20 in. of rope exposed, hook the rope in the
notch of the roller.
13. Rotate the roller four or five turns counter-clock-
wise; then release the rope from the notch and allow
the rope to retract.
14. Pull the rope out two or three times to check for cor-
rect tension.
NOTE: Increasing the rotations in step 13 will
increase spring tension.
INSTALLING
1. Place the starter assembly into position against the
magneto case.
2. Secure the starter with cap screws. Tighten to 96
in.-lb.
NOTE: Before tightening the cap screws, slowly pull
the recoil rope until the pawl engages; then tighten
the cap screws centering the recoil against the mag-
neto case.
3. Thread the rope through the bushing in the console;
then install the handle and secure with a knot. Seat
the cap.
4. Release the slip-knot in the rope.
Arctic Power Valve (APV)
System
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.
COMPONENTS
The main components of the APV system are the follow-
ing.
A. Lighting Coil
B. Voltage Regulator/Rectifier
C. ECM
D. Servomotor
E. Power Valve Cables
F. Power Valves
Lighting Coil
The AC current generated by the lighting coil flowing to
the regulator/rectifier is the power source for the APV
system.
Voltage Regulator/Rectifier
The AC current from the power coil first enters the regu-
lator/rectifier changing from AC current to DC current.
Since the APV circuit cannot use pulsating DC current, it
must be converted (by the condenser) to straight DC cur-
rent. AC current enters the ECM from the lighting coil
and is changed from AC to DC current by a rectifier
located within the ECM.
ECM
The computer within the ECM has been programmed to
cycle the power valves each time the engine is started.
When the engine is started, DC current is routed to the
servomotor by the ECM.
Servomotor
The servomotor consists of two circuits. One circuit is a
DC circuit operating the DC motor within the servomo-
tor, and the other is a potentiometer measuring the pulley
position based on voltage.
The computer within the ECM has been programmed to
operate the servomotor between a low and high voltage
range. If voltage is not within the range, the computer
will shut down the APV circuit. The computer will then
make a total of three more attempts to cycle the power
valves. If the correct voltage or pulley position isn’t seen,
the APV circuit is shut down and no more attempts will
be made until the engine is shut down and restarted.
Exhaust Valve Cables
The exhaust valves are connected to the actuating cables
and, along with the return springs, are contained inside
the APV housing on the exhaust side of each cylinder.
The other end of the actuating cable is connected to the
servomotor.
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