Snowmobile Polaris RMK Shift / RMK / Dragon RMK (2008 year). Manual - part 20

81

MAINTENANCE

Intake Filters

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

CAUTION

Operating the snowmobile with the intake filters removed may cause intake 

icing. The result will be poor fuel economy or intake malfunction. Always rein-

stall the intake filters before operating the snowmobile.

Intake Foam Filters/Pre-filter

82

MAINTENANCE

Fuel Injectors (Fuel Injected Models)

All fuel injector service must be performed by an authorized Polaris 
dealer. Do not attempt to clean or service the fuel injectors.

Fuel Pump

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

Fuel Filter

See your Polaris dealer for replacement of the fuel filter at the intervals 
outlined in the Periodic Maintenance Table beginning on page 72.

Fuel Lines

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

Oil Lines

Inspect oil line condition at the intervals outlined in the Periodic Main-
tenance Table beginning on page 72.

Oil Filter

Have your dealer change the oil filter 
and bleed the system at the intervals 
outlined in the Periodic Maintenance 
Table beginning on page 72. 

NOTE:

The direction of the arrows indi-

cates the direction of flow 

through the filter.

CAUTION

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.

83

MAINTENANCE

Carburetor (Carbureted Models)

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. It's your dealer's responsibility to make sure the correct main 
jet is installed.

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

CAUTION

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.

84

MAINTENANCE

Carburetor (Carbureted Models)

Carburetor Water/Sediment Trap

Most Polaris snowmobiles contain patented carburetor bowl water/sedi-
ment traps located at the bottom of each carburetor. The trap, consisting 
of a hose with a plug, should be drained about every 1000 miles (1600 
km) and inspected for contamination.

Cleaning Procedure
1. Turn the fuel valve off.

2. Place a container or shop 

towels below the plug to 
catch drained fuel.

3. Slide the clamp away from 

the drain plug and remove 
the drain plug from the sedi-
ment tube.

4. Wipe residue from the plug 

and reinstall it. Reposition 
and tighten the clamp. 

5. Repeat the draining proce-

dure for any remaining traps.

WARNING

When draining the traps, fuel spillage will occur. Always work in a well venti-

lated area away from anything that may cause the fuel to ignite, such as open 

flames, sparks, heaters, trouble lights, cigarettes, etc. Review the fuel warn-

ings on page 60.

Clamp

Drain 

Plug