2
9850060 R02 - 2020-2021 850 AXYS™ Long Track Snowmobile Service Manual
© Copyright Polaris Inc.
2.21
SPARK PLUG MAINTENANCE
Inspect / replace the spark plugs as outlined in the
periodic maintenance table. The spark plugs
q
can be
serviced by opening the left and right door panels and
removing the hood.
Replace spark plug if the following is observed:
• Electrode damage / insulator cracked
• Electrode / insulator is fouled
• Regular replacement interval found on maintenance
table
When inspecting a spark plug, take note of the electrode
and insulator color. A light brown/dark tan color indicates
the engine is running properly. If the spark plug
electrode/insulator is white, the engine may be running
lean. Inspect the engine, throttle body boots, etc. for air
leaks.
If the spark plug electrode/insulator is black, oily, or
shows heavy soot, the engine may be running rich.
Inspect the engine, fuel system, and lubrication system
for problems.
Set the electrode gap to specification before installing a
new spark plug.
MEASUREMENT
NGK BPR9ES Gap:
.027″ (0.70 mm)
When installing spark plug(s), install clean and dry.
Torque to specification.
TORQUE
Spark Plug Torque:
22 ft-lbs (30 N·m)
SPARK PLUG WIRE / CAP
MAINTENANCE
Visually inspect the terminal ring inside the cap and the
spark plug tip for oblong or uneven wear. Replace the
spark plug and corresponding cap if the wear patterns on
the cap terminal ring and spark plug terminal resemble
the photos below.
Spark Plug Cap Terminal Ring Wear:
• If terminal is deformed, replace the spark cap / plug.
Spark Plug Cap Terminal Wear:
• If wear is found below indentation the spark plug is
good.
• If wear is found on or above indentation the spark plug
needs to be replaced.
Use gentle force and a slight twisting motion when
installing plug caps. An audible “click” should be heard
when the terminal ring is properly seated below terminal
tip indentation.
NOTICE
MAG and PTO coil wires will be labeled on wiring.
MAINTENANCE
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