PERFORMANCE TIPS 67
DRIVE CLUTCH/DRIVEN PUL-
LEY PARALLELISM — If prema-
ture drive belt wear is experienced or if
the drive belt turns over, parallelism
must be checked. Also, parallelism
must be checked whenever either the
drive clutch or driven pulley is ser-
viced.
NOTE: For checking parallelism,
it is necessary to use Clutch Align-
ment Bar (p/n 0644-509). This spe-
cial tool can be purchased from an
authorized Arctic Cat Snowmobile
dealer.
To check parallelism, use the following
procedure.
1. Remove the drive belt; then open
the driven sheaves and place
clutch alignment bar between the
sheaves. Release the sheaves.
2. Check the parallelism of the drive
clutch/driven pulley using the par-
allelism bar and reference points X
and Y with the parallelism bar
between the driven sheaves. Using
a caliper or a machinist’s scale,
measure X and Y from the back
side of the parallelism bar to the
back side of the drive clutch
sheave. Measurement Y must be
0.060 in. ± 0.020 in. more than
measurement X, but Y must not
exceed measurement X by more
than 0.100 in.
0744-609
3. If parallelism is not within specifi-
cations, the parallelism must be
corrected by first loosening all the
engine mounting bolts (left side,
front, and right top rear). Then, pry
the front of the engine towards the
MAG-side of the engine compart-
ment. Next tighten the left-side
mounting bolts followed by the
front and right-top rear bolts. Re-
check the parallelism. If still out of
specification, repeat correction
procedure.
CARBURETOR MAIN JETS
(Bearcat 570/T570 Models) — Proper
carburetion 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
jets MUST be changed whenever the
temperature changes 20° F or when-
ever operating altitude varies by more
than 1000 feet. The Carburetor Jet
Chart on the belt guard of the snowmo-
bile identifies the proper main jets to
use under all operating temperatures
and altitudes. Follow the Carburetor Jet
Chart carefully to obtain peak engine
performance and avoid engine damage.
GASOLINE — Do not exceed the
recommended 87 octane gasoline.
Using a higher octane gasoline will not
increase overall performance; however,
the TZ1 Turbo model will detect lower
octane gasoline and reduced engine
performance will result. It is recom-
mended that 91 octane (minimum) gas-
oline be used in the TZ1 Turbo models.
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