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3. Lock the adjustment by bottoming the jam nut
against the chain case.
EFI SYSTEM
Introduction
The EFI system is lightweight in design and is made
up of a number of components explained in this sub-
section. The EFI system eliminates the worry of
changing main jets to compensate for altitude or tem-
perature. This EFI system will provide quick and easy
starting under all conditions.
The Arctic Cat EFI System operates off a series of
coils located on the stator and is made up of the fol-
lowing components.
1. Charge coils (1 and 2), located on the stator, pro-
vide AC voltage to the ECU where AC voltage is
converted to DC voltage.
2. A fuel pump coil located on the stator operates the
low voltage, high output fuel pump. At cranking
speed, the high output fuel pump provides enough
fuel to charge the fuel rail.
3. An injector coil located on the stator provides the
injectors with DC voltage for operation through
the ECU.
4. A lighting coil located on the stator plate provides
output to the voltage regulator to operate accesso-
ries and the lighting system.
5. An electrical control unit (ECU) calculates input
from sensors (air temperature sensor, coolant tem-
perature sensor, throttle position sensor, ignition
timing sensor, barometric pressure sensor) to pro-
vide the engine with the correct fuel mixture and
timing for optimum operation.
EFI Features
1. Automatic compensation for temperature.
2. Automatic compensation for altitude.
3. Optimum throttle response through high pressure
injection.
4. Quick starting in every condition.
5. Improved fuel efficiency with maximum mileage
in every condition.
6. Engine RPM more stable in every condition.
Precautions
! WARNING
Whenever working on the fuel system if a fuel hose is
removed from any component, slowly bleed the pres-
sure from the hose into an absorbent towel before
removing the hose from the component.
! WARNING
Always tighten fuel hose clamps securely.
CAUTION
Always use resistor-type spark plugs and spark plug
caps. Non-resistor components will cause the ECU to
malfunction.
Flooded Engine
If the engine should become flooded, set the brake
lever lock, compress the throttle lever to the full-open
position, and crank the engine over until it starts and
clears itself. Release the brake lever lock.
Fuel System
The EFI fuel system consists of the following compo-
nents.
1. Gas tank
2. Electric high output fuel pump
3. Three pick-up valves with micron screens
4. High-pressure fuel hose
5. Fuel rail
6. Fuel pressure regulator
7. Throttle body assembly
8. Fuel injectors
9. ECU
These components are grouped into the fuel handling
system. They work together along with electrical sen-
sors (following list) and the ECU to provide the engine
with a precise fuel mixture for combustion.
1. Ignition Timing Sensor
729-325A
29
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