Snowmobile Polaris 600 IQ Racer (2015 year). Instruction - part 16

67

MAINTENANCE

Spark Plugs

Spark Plug Condition

Normal

The normal insulator tip is gray, tan or light brown. There will be few 
combustion deposits. The electrodes are not burned or eroded. This 
indicates the proper type and heat range for the engine and the service.

TIP: The tip should not be white. A white insulator tip indicates overheating, 

caused by use of an improper spark plug or incorrect carburetor/throttle 
body adjustments.

Wet Fouled

The wet fouled insulator tip is black. A damp oil film covers the firing 
end. There may be a carbon layer over the entire nose. Generally, the 
electrodes are not worn. General causes of fouling are excessive oil, use 
of non-recommended injection oil, improper use of the choke, or 
incorrect carburetion adjustments.

Spark Plug Removal and Replacement

1. Remove the spark plug cap.

2. Using the special wrench provided in 

the tool pouch, rotate the spark plug 
counterclockwise to remove.

3. Reverse the procedure for spark plug 

installation. 

4. Torque to 18-22 ft. lbs. (24-30 Nm).

5. Reinstall the spark plug cap.

68

MAINTENANCE

Intake Filters

The intake foam filters limit snow 
ingestion into the intake system. 
When operating in loose powder 
snow, check the foam filters 
periodically to remove any 
accumulation of snow.

NOTICE: Operating the snowmobile 

with the intake filters 
removed may cause carbu-
retor icing. The result will 
be poor fuel economy or 
carburetor malfunction. 
Always reinstall the intake 
filters before operating the 
snowmobile.

Variable Exhaust System (VES)

Maintenance of the VES is limited to a periodic inspection and cleaning 
of system components. Bring the machine to an authorized POLARIS 
dealer to have the VES disassembled, inspected and cleaned at the 
intervals outlined in the maintenance charts beginning on page 59.

To ensure maximum performance and minimize required maintenance, 
follow the oil recommendations on page 51. The use of other lubricants 
may cause improper function of the valve mechanism and increase the 
frequency of required cleaning due to excessive build-up of carbon 
deposits.

Fuel Pump

All fuel pump service must be performed by an authorized POLARIS 
dealer. Do not attempt to service the fuel pump.

X

69

MAINTENANCE

Fuel Filter/Fuel Lines

See your POLARIS dealer for replacement of the fuel filter every 1000 
miles (1600 km), or annually.

Inspect the fuel lines regularly for signs of deterioration or damage. 
Always check fuel line condition after periods of storage. Normal 
deterioration from weather and fuel compounds may occur. Replace 
worn or damaged fuel lines promptly.

NOTICE: Kinking the fuel lines or using a pliers or similar tools to remove fuel 

lines may cause damage to the lines. If a fuel line has been damaged 
or kinked, replace it promptly.

Carburetor

The number stamped in the end of the main jet indicates the jet size. The 
jet installed at the time of manufacture is not necessarily correct for your 
elevation. Always ensure that the correct jets are installed in the 
machine for the geographical area of operation. 

NOTICE: Operating the snowmobile with incorrect jetting can result in serious 

engine damage. Have your POLARIS dealer perform all carburetor 
adjustments to ensure all adjustments are done correctly.

Carburetor Adjustments

The frequency at which the carburetors are synchronized or balanced is 
important. Properly adjusted carburetors can greatly improve engine 
performance, fuel economy, engine life, and reliability.

If you notice any of the following conditions, the carburetor may need 
adjustment:

• Hard starting
• Poor idle
• Overheated pistons and cylinder walls
• Plug fouling
• Poor engine response to various throttle valve openings

70

MAINTENANCE

Cooling System

Coolant

POLARIS recommends the use of POLARIS Antifreeze 50/50 Premix. 
This antifreeze is already premixed and ready to use. Do not dilute with 
water. See page 100 for the part numbers of POLARIS products. If the 
vehicle will be stored or operated at extremely low temperatures, greater 
protection may be required. Please see your POLARIS dealer. 

Any time the cooling system has been drained for maintenance or repair, 
replace the coolant with fresh Antifreeze 50/50 Premix.

NOTICE: Never add tap water to the cooling system. Minerals cause deposits 

and may react adversely with the metals in the engine and cooling 
system.

Coolant Level

The engine coolant level is controlled by the recovery system. The 
recovery system components are:

• Coolant bottle or overflow tank
• Engine filler neck
• Pressure cap
• Connecting hoses

Always maintain the coolant level at the “full cold” line on the coolant 
bottle when the engine is cold.

NOTICE: Operating the snowmobile with insufficient coolant will result in 

overheating and serious engine damage. Always maintain the coolant 
level as recommended.