Snowmobile Arctic Cat (2008 year). Manual - part 8

1-27

1

Mikuni Tuning 

Components

* For models with carburetor switch

MAIN JETS AVAILABLE

JET

P/N

JET

P/N

130

6505-216

210

6505-145

140

6505-217

220

6505-137

150

6505-168

230

6505-067

160

6505-064

240

6505-079

170

6505-065

250

6505-068

180

6505-056

260

6505-017

190

6505-066

270

6505-069

200

6505-144

280

6505-080

JET NEEDLES AVAILABLE

JET NEEDLE

P/N

JET NEEDLE

P/N

6CE25

6506-408

6DH3

6505-509

6CH3

6505-519

6DH4

6505-003

6DH2

6505-252

6DH7

6505-215

PILOT JETS AVAILABLE

JET NO.

P/N

35

6505-029

40

6505-047

PISTON VALVES AVAILABLE

SLIDE

CARB. SIZE (mm)

P/N

2.5

32-34

6505-246

3.5

32-34

6505-248

2.5

34

6505-500

2.5

34

6505-614*

3.0

34

6505-507

3.0

34

6505-561*

NEEDLE JETS AVAILABLE

NEEDLE JET

P/N

P-4M (961)

6506-407

P-5M (953)

6506-405

INLET NEEDLE ASSEMBLIES AVAILABLE

SEAT DIA.

CARB. SIZE (mm)

P/N

1.5 mm (Steel)

28, 30, 32, 34

6505-026

1.5 mm (Viton)

28, 30, 32, 34

6505-160

1.5 mm (Steel)

28 — 34 GVM

6505-245

1-28

Major Tuning 

Components

To assist you in selecting three major tuning components of the carburetor, listed below are the jet needles, pilot

jets, and piston valves on charts according to their size.

„NOTE: The above chart shows the average per-
formance of a given needle between 1/4 and 3/4
throttle. Needles are constructed in such a way
that at any given point, the needle could be richer
or leaner than the rating it has.

JET NEEDLES

LEAN

6CE25

6DH2

6DH3

6DH4

6DH7

RICH

PILOT JETS

LEAN

35

RICH

40

PISTON VALVES

LEAN

3.5

3.0

RICH

2.5

1-29

1

Electrical 

Specifications

(370 cc)

„NOTE: The ignition system is a Normally Open Ignition (NOI).

Peak Voltage Tests were made with the Fluke Model 73 Multimeter (p/n 0644-191) set to the DC Volt scale and the

Peak Voltage Reading Adapter (p/n 0644-307) with the main harness connectors plugged in, spark plugs removed

and grounded, and by pulling the recoil starter rope briskly.

„NOTE: Lighting coil output is unregulated voltage.

Description

Resistance Test

Test Value 

 + Test Connections - 

Ignition Coil
Primary (External)
Secondary

0.26-0.35 ohm
6800-10,200 ohms

orange
high tension wire

black
high tension wire

Stator Coil (Charge)

128-192 ohms

red/white

black/red

Lighting Coil

0.17-0.26 ohm

yellow

yellow

Spark-Plug Cap

4000-6000 ohms

cap end

cap end

Description

Test Value 

+ Test Connections -

Voltage Regulator

11-14 AC volts

yellow

brown

Low Oil-Light Sending Unit

Less than 1 ohm
(float end down)

terminal

terminal

Ignition Switch

Less than 1 ohm
(key in OFF position)

terminal

terminal

Description

Peak Voltage Test

+ Test Connections -

Primary Coil (External)

170-187V

orange

black

Stator Coil (Charge)

200-220V

red/white

black/red

Lighting Coil

9.0-9.9V

yellow

yellow

! WARNING

Most voltages generated by the ignition system are sufficient to interrupt pacemakers! All technicians, espe-
cially those using pacemakers, must avoid contact with all electrical connections when pulling the recoil starter
rope or after the engine has been started.

1-30

Electrical 

Specifications

(570 cc Models)

„NOTE: The ignition system is a Normally Open Ignition (NOI).

Peak Voltage Tests were made with the Fluke Model 73 Multimeter (p/n 0644-191) set to the DC Volt scale and the

Peak Voltage Reading Adapter (p/n 0644-307) with the main harness connectors plugged in, spark plugs removed

and grounded, and by pulling the recoil starter rope briskly.

„NOTE: Lighting coil output is unregulated voltage.

Description

Resistance Test

Test Value 

 + Test Connections -

Ignition Coil
Primary (External)
Secondary

0.26-0.35 ohm
6800-10,200 ohms

orange
high tension wire

black/white
high tension wire

Charge Coil (1) 

12-18 ohms

black/red

green/red

Charge Coil (2)

12-18 ohms

brown/white

green/red

Ignition Timing Sensor

148-222 ohms

green/white

brown

Lighting Coil

0.12-0.18 ohm

yellow

yellow

Spark-Plug Cap

4000-6000 ohms

cap end

cap end

Description

Test Value 

 + Test Connections -

Voltage Regulator 

11-14 AC volts

yellow

brown

Low Oil-Light Sending Unit

Less than 1 ohm
(float end down)

terminal

terminal

Ignition Switch

Less than 1 ohm
(key in OFF position)

terminal

terminal

Description

Peak Voltage Test

 + Test Connections -

Primary Coil (External) 

185-204V

orange

black

Charge Coil (1)

69-76V

black/red

green/red

Charge Coil (2)

79-87V

brown/white

green/red

Ignition Timing Sensor

1.4-1.6V

green/white

brown

Lighting Coil

7.0-7.7V

yellow

yellow

! WARNING

Most voltages generated by the ignition system are sufficient to interrupt pacemakers! All technicians, espe-
cially those using pacemakers, must avoid contact with all electrical connections when pulling the recoil starter
rope or after the engine has been started.