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Pre-Maintenance
Checks
1.
Remove the fuel tank cap, ensure vent hole is
not plugged. On models with two tanks, the
rear tank is equipped with the vented cap; the
front tank uses a sealed cap. If the hole is
plugged, remove the obstruction by washing
the cap.
Fig. 5-1
Vented Cap
I
PANTERA FA (Dual Tanks)
Non-Vented Cap
0725·175
2.
Remove the in-line fuel filter; then plug the
fuel line. If the filter is dirty, either backflush
or replace the filter.
3.
Remove the plug from the fuel line; then
install a new or clean filter.
Carburetor
The 1978 Arctic Cat snowmobiles are equipped
with Mikuni VM series carburetors. These float-
type carburetors are equipped with both a low
speed (pilot) system and a high speed (main)
system. The carburetors are designed to provide
efficient operation from idle to wide open throttle
(WOT). The primary function of the carburetor is
to meter a precise volume of fuel to be mixed with
air, resulting in a volatile gas that can be ignited
by the spark plug.
67
4.
Check the fuel lines to ensure that all lines
are correctly connected. If any cracks are
evident in the lines, replace the lines.
5.
Check the impulse line for correct connec-
tion on both the fuel pump and crankcase
fitting.
The adjustments forthe Mikuni carburetor can be
divided into two basic categories: external and
internal adjustments. The external adjustments
can be made with the carburetor on the snowmo-
bile. The internal adjustments will require the
removal of the carburetor and carburetor dis-
assembly.
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