Service manual
~eM131
SERVICE
AND
REPAIR
I~
1::
CAUTION
Never
run
the
engine
inside
a
building
without
first
opening
all
doors
and
win-
dows
to
insure
proper
ventilation.
TRACTION
BELT
Figure
J6
•
Set
the
snowmobile
on
its
kickstand
and
start
the
engine.
Allow
track
to
rotate
several
turns
and
then
repeat
the
track
tension
adjustment
procedure
to
ensure
that
proper
tension
is
maintained.
•
Retighten
the
locknuts
(1)
on
both
sides
of
the
snowmobile.
Spark Plug Interchangeability
The
following
tabulation
is
provided
to
show
correct
spark-plug
interchangeability.
Bosch
Champion
AC
Autolite
Lodge
NGK
M175T1
UK-10
M84
BZ3 HTN18
AB-o
M225T1
K-9
M83 HTN18
A-7
M240T1 UK-7
Wiring Diagrams
Electrical
wiring
diagrams
are
provided
for
the
trained
technicians
using
this
manual.
Each
dia-
gram
is
identified
with
the
model
number
of
the
snowmobile
to
which
it
applies.
Troubleshooting
ENGINE HARD TO START.
Fuel
line
blocked
or
leaking;
ruptured
fuel-pump
diaphragm;
ignition
or
switch
wiring
loose
or
grounded;
spark
plug(s)
fouled
or
faulty;
contact
breaker
pOints
pitted
or
burned.
J6
ENGINE STOPS.
Fuel
tank
empty; fuel flow
ob-
struc
ted;
igni
t
ion
system
faulty.
Spark
plug(s)
fouled
or
dirty.
Engine too
hotandpis
t
ons
sei
zing;
carburetor
setting
too
lean
or
incorrect
grade
of
oil
being
used.
ENGINE STOPS,
FUEL
TANK
HALF
EMPTY.
Carburetor-to-tank
fuel
line
connected
incorrectly.
Be
certain
the
gas
tank-to-carbure
t
or
line
is
con-
nected
to
the
OUT
fitting
on
the
gas
tank
outlet
and
to
the
inlet
fitting
on
the
carburetor.
The
recir-
culating
line,
carburetor-to-tank
must
be
connected
to
the
IN
fitting
on
the
gas
tank
outlet
(figure
12)
and to
the
recirculating
elbow
(
figure
8).
ENGINE
OPERATES
IRREGULARLY.
Spark
plug
loose,
fouled
or
faulty;
ignition
switch
wiring
grounded;
carburetor
trouble.
Engine
holddown
bolts
loose;
carburetor
dirty.
Ignition
timing
off.
ENGINE WORKING
FOUR-STROKE. Choke
shut;
carburetor
settings
incorrect;
dirt
preventing
car-
buretor
inlet
needles
from
seating
properly.
ENGINE LOSES POWER.
Poor
compression
due
to
loose
head
and
crankcase
bolts.
Faulty
ignition;
timing;
piston
rings
sticking
due
to
the
use
of
improper
oil.
Car
bon
deposits
in
cylinder.
ENGINE BACKFIRES THROUGH CARBURETORS.
Carburetor
fuel-supply
channel
clogged.
ENGINE
BACKFIRES THROUGH EXHAUST.
In-
correct
or
faulty
spark
plug(s);
fa
ul
ty
ignition
coil
or
condenser;
loose
ignition
wiring.
ENGINE OVERHEATS.
Insufficient
or
incorrect
grade
oil
in
fuel
mixture;
carburetor
or
fuel
line
partly
clogged;
carburetor
setting
too
lean;
ignition
timing
too
slow.
EXCESSIVE
FUEL
CONSUMPTION.
Carburetor
fuel
line
or
gas
tank
leaking;
choke
closed;
incorrect
carburetor
setting.
THROTTLE
CONTROL.
Excessive
play
in
throttle
control
lever
caused
by
loose
throttle
control
cable.
STEERING.
Poor
steering
ability
caused
by
im-
properly
adjusted
Skis;
steering
linkage
loose
or
out
of
adjustment.
U-bracket
bolts
on
roll
bar
too
tight
or
too
loose.
Spring,
U-bracket
loose.
BRA-KES.
Excessive
play
in
handbrake
due to
loose
brake
cable
or
worn
pads
.
)