Muffler/Spark Arrester; Spark Plug - Arctic Cat 400TRV 2011 Service Manual

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 NOTE: The engine should be warm (operating tem-
perature) and the battery full charged for an accurate
compression test. Throttle must be in the wide-open
throttle (WOT) position. In the event the engine can
not be run, cold values are included.
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)
95-115
120-140
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. Valve not bent or burned.
F. Valve seat not burned.
 NOTE: To service valves, see Section 3.
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 piston
rings (see Section 3).

Spark Plug

A light brown insulator indicates that a plug is correct. A
white or dark insulator indicates that the engine may need
to be serviced or the carburetor may need to be adjusted.
To maintain a hot, strong spark, keep the plug free of car-
bon.
PSI Cold (WOT)
N/A
80-120
ATV-0051
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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 0.7-0.8 mm (0.028-0.032 in.) for proper
ignition. Use a feeler gauge to check the gap.
When installing the spark plug, be sure to tighten it
securely. 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

At the intervals shown in the Periodic Maintenance
Chart, clean the spark arrester using the following proce-
dure.
! 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.
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.
Section
Table of Contents
2
ATV0052C
CF105A
2-5