10
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).
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
Adjust the gap to 0.7-0.8 mm (0.028-0.031 in.).
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:
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.
PSI Hot (WOT) PSI Cold (WOT)
125-145 100-140
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.
! WARNING
Wait until the muffler cools to avoid burns.
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