Valve Clearance - Arctic Cat ZR 3000 Operator's Manual

1. Remove the spark plug end caps.
2. Using a 3/8-in.
adapter, and a 5/8-in. spark plug
socket, remove the spark plugs.

NOTE: Prior to installing the spark
plugs, check the gap between the
electrode and ground strap. The clear-
ance should be 0.7-0.8 mm (0.028-
0.031 in.).
3. Install the spark plugs. Tighten to 96
in.-lb.
4. Install the spark plug end caps.
5. Install the hood and access panels.
Checking
To see if the spark plugs being used are of
the proper heat range (after the snowmo-
bile has been operated under normal driv-
ing conditions), remove the spark plugs
and examine the condition of the center
electrode insulator of each spark plug.
A. TAN or LIGHT BROWN insula-
tor indicates correct spark plugs
(heat range).
B. LIGHT GRAY or WHITE insula-
tor indicates over-heating of the
engine. This condition is caused by
a too lean condition or incorrect
spark plugs (heat range too hot).
C. BLACK insulator indicates fuel
in the combustion chamber is not
burning completely. This condi-
tion is caused by a too rich con-
dition, too much oil, or incorrect
spark plugs (heat range too cold).
30

lators are light gray, white, or black,
drive ratchet,
oil-injection pump synchronization,
and ignition timing are correct, differ-
ent heat-range spark plugs may be
necessary.
Snowmobile dealers have detailed
spark plug information. Consult a
dealer before changing spark plugs,
as incorrect heat-range spark plugs
could cause poor engine performance
or engine damage.

Valve Clearance

7000
After 25,000 miles or prior to seasonal
storage, valve clearance should be
checked and adjusted as necessary.

authorized Arctic Cat Snowmobile
dealer for inspection and service.
This service is at the discretion and
expense of the snowmobile owner.
AO352A
3000/5000
After 5000 miles or prior to seasonal
storage, valve clearance should be
checked and adjusted as necessary.

authorized Arctic Cat Snowmobile
dealer for inspection and service.
This service is at the discretion and
expense of the snowmobile owner.
NOTE: If the center electrode insu-
Authorized
CAUTION
If a spark plug is light gray, white, or
black and another is tan or light
brown, take the snowmobile to an
authorized Arctic Cat Snowmobile
dealer for inspection and service. If
not under warranty, this service is at
the discretion and expense of the
snowmobile owner.
NOTE: Take the snowmobile to an
CAUTION
It is critical that the checking/adjust-
ing valve clearance be done at the
recommended intervals or severe
engine damage may occur.
NOTE: Take the snowmobile to an
CAUTION
It is critical that the checking/adjust-
ing valve clearance be done at the
recommended intervals or severe
engine damage may occur.
Arctic Cat