Arctic Cat 2014 SNO PRO 500, Operator'S Manual

Page: 65 / 90

61
5. If the check valves are within specifications but
the oil-injection usage is not, replace the oil-injec-
tion pump.
SPARK PLUGS
Correct gap is 0.7-0.8 mm (0.028-0.031 in.).
Checking Spark Plugs
To check spark plug condition and to aid in determin-
ing correct fuel/air mixture, pull the spark plug caps
off the spark plugs, remove the spark plugs, and exam-
ine the condition of the center electrode insulator of
each spark plug.
0725-048
A. TAN or LIGHT BROWN insulator indicates
correct spark plugs (heat range).
B. LIGHT GRAY or WHITE insulator indicates
overheating of the engine. This condition is
caused by a too lean condition, ignition timing
set too high, or incorrect spark plugs (heat
range too hot).
C. BLACK insulator indicates fuel in the combus-
tion chamber is not burning completely. This
condition is caused by a too rich condition.
TRACK DRIVE
Removing
1. Remove the hood and right and left side panels
and set aside; then remove the resonator.
2. Place a suitable safety stand beneath the rear bum-
per taking the weight of the snowmobile off the
rear suspension.
3. Remove the three nuts securing the left side of the
track drive and discard.
RS079A
4. Remove the cap screws securing the slide rail
assembly.

NOTE: At this time, it is recommended to have
the snowmobile tipped on the left-side.
5. Remove the four screws securing the right-side toe
shield; then remove the six cap screws securing
the chain case cover. Remove cover.
6. Loosen the jam nut and the chain tensioner enough
to remove the chain and sprockets; then remove
the chain and sprockets. Remove chain lube oil.
Discard both nuts and washers securing the
sprockets.
744-070A
7. Remove the three nuts securing the right side of
the track drive; then remove the O-ring seal and
bearing. Discard nuts and O-ring seal.
8. Remove the track and drive assembly.

NOTE: At this point, inspect the bearings for
wear or roughness. Replace as necessary.
Installing
1. Place the track drive assembly into position and
secure the right side with the bearing, new O-ring
seal, and new nuts. Tighten to 15 ft-lb.
2. Install existing chain and sprockets and secure
with new washers and nuts. Tighten to 50 ft-lb.
3. Tighten chain tensioner; then install chain lube.
4. Install chain case cover using existing six cap
screws. Tighten to 15 ft-lb.
CAUTION
Whenever servicing the oil-injection system, use a
100:1 gas/oil mixture in the gas tank to ensure ade-
quate engine lubrication. Failure to use the 100:1 mix-
ture to the oil-injection system will result in severe
engine damage.