17
1. Using the appropriate stud template
(see chart), mark the desired stud
pattern to be used.
2. Using the proper-sized stud hole
drill bit, drill out the stud holes.
3. Push the stud through the hole from
inside the track; then place the
domed support plate and lock nut on
the exposed stud.
4. Using a wrench to secure the stud,
tighten the lock nut on the exposed stud.
It is also recommended that whenever
studs are installed on a track, carbide
wear bars should be installed on the skis.
Carbide wear bars complement the track
studs to balance steering control under
these conditions. The length of the car-
bide on the wear bars should be propor-
tionate to the number of track studs (i.e.
small number of track studs — short
length of carbide...many track studs —
long length of carbide). The proper pro-
portion between the number of studs and
carbide length on the wear bar will main-
tain steering balance.
Reverse Operation
The engine reverse function offers the
operator the convenience of being able to
back up the snowmobile rather than hav-
ing to turn the snowmobile around by
hand. This feature, under most situations,
should not be used to free a stuck snow-
mobile as it will tend to dig the skis
deeper into the snow. Always use mini-
mal speed when operating in reverse and
come to a complete stop before shifting
from either forward to reverse or reverse
to forward.
Shifting Into Reverse
741-438A
NOTE: Correct drive belt tension
(deflection) is important for the
reverse function to operate properly.
If the belt is too tight, difficulty in
engaging reverse will be experi-
enced (the reverse function will
make up to three attempts to engage
into reverse, and if the function is
not completed after the third
attempt, the engine will shut down).
1. Always warm up the engine for 2-3
minutes prior to shifting into reverse.
The reverse function is cancelled
when engine temperature is below or
above normal operating range.
2. Shift only with the engine at idle
RPM and the snowmobile com-
pletely stopped. The reverse func-
tion will not engage if engine is
above 3000 RPM.
Stud Template Chart
Track Length
p/n
129 in.
6639-461
137 in.
6639-462
141 in.
4639-991
! WARNING
Always balance the snowmobile with
the proper proportion between the
number of studs and carbide length
on the wear bars. Do not “over drive”
conditions; use common sense in all
operating conditions.
CAUTION
Do not use studs that are more than
9.525 mm (0.375 in.) longer than the
track lug height.
! WARNING
Do not operate a snowmobile with
loose studs as they may be thrown
from the track. Always use a shielded
safety stand whenever performing
any maintenance or adjustments.
! WARNING
DO NOT stand behind the snowmo-
bile or near the rotating track. NEVER
run the track at high speed when the
track is suspended.
