Spark Plug; Muffler/Spark Arrester - Arctic Cat VLX 70002017 Service Manual

5. While holding the throttle lever in the full-open posi-
tion, crank the engine over with the electric starter
until the gauge shows a peak reading (five to 10
compression strokes).
COMPRESSION
PSI Hot (WOT)
125-145
6. If compression is abnormally low, inspect the
following items.
A. Verify starter cranks engine over at normal speed
(approximately 400 RPM).
B. Gauge functioning properly.
C. Throttle lever in the full-open position.
D. Valve/tappet clearance correct.
E. Engine warmed up.
F. Intake not restricted.
NOTE: To service valves, see Engine/Transmission.

7. Pour 29.5 ml (1 fl oz) of oil into the spark plug hole,
reattach the gauge, and retest compression.
8. If compression is now evident, service the top end
(see Engine/Transmission).

Spark Plug

A light brown insulator indicates that a plug and the
fuel/air ratio are correct. A white or dark insulator indi-
cates that the engine may need to be serviced. To main-
tain a hot, strong spark, keep the plug free of carbon.
ATV-0051
CAUTION
Before removing a 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 correct specification (see General Infor-
mation for proper type and gap). Use a feeler gauge to
check the gap.
8
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 con-
tacts the cylinder head.

Muffler/Spark Arrester

Clean the spark arrester using the following procedure.
! WARNING
Wait until the muffler cools to avoid burns.
1. Remove the three cap screws securing the spark
arrester assembly to the muffler; then loosen and
remove the arrester.
CF105A
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 with gasket; then
secure with the three cap screws. Tighten to 48 in.-lb.