Arctic Cat ALTERRA 400, Operator'S Manual

Page: 59 / 80

57
Spark Plug
The ATV comes equipped with a specified
spark plug. See the Specifications chart for
the correct spark plug and the correct gap.
A light brown insulator indicates that the
plug is correct. A white or dark insulator
indicates that the engine may need to be
serviced or the carburetor (on the 400) may
need to be adjusted. Consult an authorized
Arctic Cat ATV dealer if the plug insulator
is not a light brown color.
To help prevent cold weather fouling,
make sure to thoroughly warm up the
engine before operating. To maintain a hot,
strong spark, keep the plug free of carbon.
Before removing the spark plug, be sure
to clean the area around the spark plug. If
you do not, dirt could enter engine when
removing or installing the spark plug.
Adjust to the recommended gap for
proper ignition. Use a wire-type feeler
gauge to check the gap.
ATV-0052
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 cyl-
inder head.
Engine Idle RPM
Adjustment (400)
To properly adjust the idle, a tachometer is
necessary. If one is not available, take the
ATV to an authorized Arctic Cat ATV dealer.
1. Start the engine and warm it up to
normal operating temperature.
2. Remove the seat; then turn the idle
adjustment screw in or out until the
engine idles at 1250-1350 RPM.
KC356A
Throttle Cable
Adjustment
To adjust the throttle cable free-play:
1. Loosen the jam nut from the throttle
cable adjuster.
2. Slide the rubber boot away and turn
the adjuster until the throttle lever
has the proper free-play of 3-6 mm
(1/8-1/4 in.).
ATV-0047
3. Tighten the knurled nut against the
throttle cable adjuster securely; then
slide the rubber boot over the
adjuster.
! WARNING
Adjust the idle to the correct RPM.
Make sure the engine is at normal
operating temperature before adjust-
ing the idle RPM.