88
PERFORMANCE TIPS
PERFORMANCE TIPS
Operating a high performance snow-
mobile requires a special attention that
is not required by a low performance
snowmobile. Often, a minor adjust-
ment will result in a large increase in
performance. This section is intended
to highlight minor conditions that
adversely affect performance and the
adjustments needed to correct them.
Be sure, however, to thoroughly read
and understand this entire manual
especially the section on spark plugs,
track tension and alignment, and sus-
pension.
DRIVE BELT
— This link between
the engine and drive train is often the
most neglected component. The drive
belt must have the proper fit in the
drive clutch and driven pulley. Proper
fit is when the top surface of the drive
belt is flush with the top or up to 1/16
in. higher than the driven pulley
sheaves (with the sheaves fully
closed). If the belt sits below this
level, the snowmobile will bog at slow
speeds and will have a slower maxi-
mum speed. To correct this condition,
first determine if the drive belt is
within specifications (see Drive Belt
section) and replace if worn or too
long. Secondly, it may be necessary to
remove a shim washer from between
the driven pulley sheaves to allow the
driven pulley to close tighter. On the
ACT roller driven pulley, adding shim
washers will decrease belt deflection
and removing shim washers will
increase belt deflection. Available
shim washers from Arctic Cat are p/n
0648-714 (0.090 in.) - one included in
the tool kit on the ACT drive models,
p/n 0648-715 (0.030 in.), and p/n
0648-716 (0.060 in.).
NOTE: On ACT roller driven pul-
ley, removing/adding shim washers
may be done by the snowmobile
owner if qualified to do so. If the
owner does not feel qualified, take
the snowmobile to an authorized
Arctic Cat Snowmobile dealer for
this service. This service is at the
discretion and expense of the
snowmobile owner.
Finally, always run the drive belt in
the same direction. Installing the drive
belt so the part number can be read
will ensure that the drive belt is
always run the same direction.
DRIVE CLUTCH AND DRIVEN
PULLEY
— Keeping the drive
clutch and driven pulley clean should
be the primary consideration of the
operator. The clutch sheaves can be
cleaned of any drive belt accumulation
using a clean cloth and parts-cleaning
solvent. All pivot points can be main-
tained clean using compressed air.
CARBURETOR MAIN JET(S)
(Carbureted Models) — Proper carbu-
retion is absolutely necessary to obtain
peak performance. Since ambient tem-
perature and operating altitude both
affect the main jet size needed for opti-
mum engine performance, the main
jet(s) MUST be changed whenever the
temperature changes 20° F or when-
ever operating altitude varies by more
than 1000 feet. The Main Jet Chart
beneath the hood of the snowmobile
identifies the proper main jet(s) to use
under all operating temperatures and
altitudes. Follow the Main Jet Chart
carefully to obtain peak engine perfor-
mance and avoid engine damage.
GASOLINE
(EFI Models) — On the
2-stroke EFI engine models for opti-
mum performance, do not exceed the
recommended 87 octane gasoline.
Using a higher octane gasoline will
not increase overall performance.
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