Spark Plug; Muffler/Spark Arrester; Engine/Transmission Oil - Filter - Tracker Off-Road 500S Service Manual

5. While holding the throttle in the full-open position,
crank the engine over with the electric starter until
the gauge stops climbing (five to 10 compression
strokes).
PSI Hot (WOT)
125-145
6. If compression is abnormally low, inspect the
following items:
A. Starter cranks engine over.
B. Gauge is functioning properly.
C. Throttle in the full-open position.
D. Valve/tappet clearance correct.
E. Engine warmed up.
F. Intake obstructed.
 NOTE: To service top-side components, see Engine/
Transmission.
7. Pour approximately 30 ml (1 fl oz) of oil into the
spark plug hole, reattach the gauge, and retest com-
pression.
8. If compression is now evident, service the top end
(see the appropriate Engine/Transmission — Top-
Side Components).

Spark Plug

A light brown insulator indicates that the plug and fuel/
air ratio are correct. A white or dark insulator indicates
that the engine may need to be serviced. To maintain a
hot, strong spark, keep the plug free of carbon.
ATV-0051
CAUTION
Before removing the spark plug, be sure to clean the
area around the spark plug. Dirt could enter engine
when removing or installing the spark plug.
Adjust the gap to 0.7-0.8 mm (0.028-0.031 in.).
10
PSI Cold (WOT)
100-140
ATV0052
A new spark plug should be tightened 1/2 turn once the
washer contacts the cylinder head. A used spark plug
should be tightened 1/8-1/4 turn once the washer contacts
the cylinder head.

Muffler/Spark Arrester

The muffler has a spark arrester which must be periodi-
cally cleaned. At the intervals shown in the Maintenance
Schedule, clean the spark arrester using the following
procedure:
! WARNING
Wait until the muffler cools to avoid burns.
1. Remove the cap screws securing the spark arrester
assembly to the muffler.
PK010
2. Using a suitable brush, clean the carbon deposits
from the screen taking care not to damage the screen.
 NOTE: If the screen or gasket is damaged in any
way, it must be replaced.
3. Install the spark arrester assembly and secure with
the cap screws. Tighten to 50 in.-lb (5.6 N-m).
Engine/Transmission Oil —
Filter
OIL — FILTER
Change the engine oil and oil filter at the scheduled inter-
vals. The engine should always be warm when the oil is
changed so the oil will drain easily and completely.