Spark Plugs

Content Source: 2021 GENERAL 4 1000 Owner’s Manual (9939898 R01) > Maintenance Chapter

IMPORTANT

The Owner's Manual for this vehicle contains warnings, instructions and other information you must read and fully understand before safely riding or performing maintenance on this vehicle.Always follow the warnings and instructions in Owner's Manual.

Click the CONTENTS link above for the Table Of Contents, or download a full PDF of the Owner Manual in the Owner Support area of Polaris.com

Spark Plugs

Spark Plug Recommendations

Refer to the Specifications section for the recommended spark plug type for your vehicle. Always torque spark plugs to specification.

NOTICE

Using non-recommended spark plugs can result in serious engine damage. Always use POLARIS-recommended spark plugs or their equivalent.

Spark Plug Gap / Torque

Electrode Gap	Plug Torque
0.7-0.8 mm	7 ft. lbs. (9.5 Nm)

Spark Plug Inspection

Spark plug condition is indicative of engine operation. The spark plug firing end condition should be read after the engine is warmed up and the vehicle is driven at higher speeds. Immediately check the spark plug for correct color.

caution

Always remove all cargo from the cargo box before lifting the box to access engine components.

Lift the cargo box. Remove the spark plug cap.

caution

A hot exhaust system and engine can cause burns. Wear protective gloves when removing a spark plug for inspection.

Using the spark plug wrench provided in the tool kit, remove the plug by rotating it counter-clockwise.
Reverse the procedure for spark plug installation. Apply anti-seize compound to the spark plug threads.
Torque to specification.

Normal Plug

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.

The tip should not be white. A white insulator tip indicates overheating, caused by use of an improper spark plug or incorrect throttle body adjustments.

Wet Fouled Plug

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: incorrect spark plug type or heat range, excessive engine oil consumption or incorrect throttle body adjustments.