Service manual
~t·5IIMI31
SERVICE
AND
REPAIR
I~
During
rea
ss
embly,
apply
18
to
20 foot pounds
torqu
e.
Spark
plug
condi tion
may
be
determined
by
the
color.
A
carbo
ni
zed
plug
is
black;
a
burnt
plug
is
pale
grey,
whereas
a
normal
functioning
spark
plug
is
brown.
{\
certain
the
gas
tank-to
-
carburetor
line
used
on
all
\ J
Mark
V
series
Ski-Daddlers
is
connected
to
the
OUT
fitting
on
the
gas
tank
outlet
and
to
the
inlet
fitting
on
the
carburetor.
The
recirculating,
carburetor-
to-tank
line
must
be
connected
to
the
IN
fitting
on
the
gas
tank
outlet
(figure
12)
and
to
the
recirculating
elbow
(figure
8).
SPARK PLUG CONVERSION
CHART
LIGHT
SERVICE SEVERE SERVICE
MODEL
NO.
ENGINE
CHAMPION
AC CHAMPION
AC
SD18E20B
Hirth
493
SD18E27A
Hirth
399
SD18P27A
Hirth
399
SD18P21A
Hirth
634
SD18E25B
Kohler 399
SD15P10B
JLO 295
*No
AC conversion
for
light service spark plug.
When
replacing
spark
plugs,
refer
to
the
preceding
chart
to
insure
proper
spark
plug
heat
rang
es
for
your
particular
engine.
NOTE:
Replacementplugs
should
be
U.S. Champion,
AC
spark
plugs
or
equivalent
available
at
your
authorized
Ski-Daddler
Dealer.
Wiring Diagrams
Electrical
wiring
diagrams
are
provided
for
the
trained
techni.cians
using
this
manual.
Each
diagram
is
identified
with
the
model
number
of
the
snow-
mobile
to
which
it
applies
(see
figures
17, 18, 19
and
20).
Troubleshooting
ENGINE HARD TO START.
Fuel
line
blocked
or
leaking;
ruptured
fuel-pump
diagram;
water
in
fuel,
flooded,
loose
impulse
line;
ignition
or
switch
wiring
loose
or
grounded;
spark
plug(s) fouled
or
faulty;
contact
breaker
points
pitted
or
burn
ed.
ENGINE
STOPS.
Fuel
tank
empty;
fuel flow
ob-
structed;
ignition
system
faulty.
Spark
plug(s)
fouled
or
dirty.
Engine
too
hot
and
pistons
seizing;
carburetor
se
tting
too
lean
or
incorrect
grade
of
oil
being
used,
impulse
line
loose.
ENGINE STOPS,
FUEL
TANK
HALF
EMPTY.
Be
K-8
K-8
K
-8
K-7
K-8
K
-9
18
*
K-7
SN82F
*
K-7
SN82F
*
K-7 SN82F
SN82F
K-60R SN82F
*
K-7
SN82F
SN83F
K·8
SN82F
ENGINE
OPERATES
IRREGULARLY.
Spark
plug
loose,
fouled
or
faulty;
ignition
switch
wiring
grounded;
carburetor
out
of
adjustment
or
dirty.
Engine
holddown
bolts
loose;
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
im-
proper
oil.
Carbon
deposits
in
cylinder.
ENGINE BACKFIRES THROUGH CARBURETORS.
Carburetor
fuel
-supp
ly
channel
clogged.
Carbu-
retor
set
too
lean.
ENGINE BACKFIRES THROUGH EXHAUST.
In-
correct
or
faulty
spark
plug(s);
faulty
ignition
coil
or
condenser;
loose
ignition
wiring.
ENGINE OVERHEATS.
Insufficient
or
incorrect
grade
oil
in
fuel
mixture;
c:;trburetor
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;
incor
-
rect
carburetor
setting.
1002472