Polaris RANGER XP 900 2017 Owner's Manual For Maintenance And Safety page 75

Spark Plugs
Spark Plug Recommendations
Refer to the specifications section beginning on page 96 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
0.7-0.8 mm
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.
1. 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.
2. Using the spark plug wrench provided in
the tool kit, remove the plug by rotating it
counter-clockwise.
3. Reverse the procedure for spark plug
installation. Apply anti-seize compound
to the spark plug threads.
4. 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.
New Plug Torque
10 ft-lbs (13.5 Nm)
Used Plug Torque
10 ft-lbs (13.5 Nm)
MAINTENANCE
Spark Plugs
73