PERFORMANCE TIPS
79
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.), p/n 0648-715
(0.030 in.), and p/n 0648-716 (0.060
in.). See an authorized Arctic Cat
Snowmobile dealer for this service.
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 accumula-
tion using a clean cloth and parts-
cleaning solvent. All pivot points can
be maintained clean using compressed
air.
The setting of the driven pulley pre-
load will vary the peak engine rpm.
Peak engine rpm is the rpm at which
the engine develops its maximum
horsepower. Optimum snowmobile
performance will result if the engine
rpm (full throttle) is within 3% of the
specifications. To increase the peak
rpm, increase the spring tension of the
driven pulley by moving the spring
end clockwise. To decrease the peak
rpm, decrease the spring tension of the
driven pulley by moving the spring
end counterclockwise. Each hole posi-
tion will change the peak engine rpm
by approximately 200 rpm. On the
ACT roller driven pulley, spring ten-
sion is adjusted using Spring Adjust-
ment Tool (p/n 0644-413).
CARBURETOR MAIN JET(S)
(Carbureted Models) — Proper carbu-
retion is absolutely necessary to
obtain peak performance. Since ambi-
ent temperature and operating altitude
both affect the main jet size needed for
optimum engine performance, the
main jet(s) MUST be changed when-
ever the temperature changes 20° F or
whenever operating altitude varies by
more than 1000 feet. The Main Jet
Chart beneath the hood of the snow-
mobile identifies the proper main
jet(s) to use under all operating tem-
peratures and altitudes. Follow the
Main Jet Chart carefully to obtain
peak engine performance and avoid
engine damage.
Summary of Contents for Z Series 2006
Page 1: ...2006 Snowmobile Operator s Manual p n 2257 327...
Page 86: ...NOTES 85 NOTES...
