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ENGINE MAINT:ENANCE -
Carburetion and Fuel System
2
.
3.
Start
the engine and
let
it
warm
up.
Increase the engine
speed
to
1,100 r
.p.m. by use
of
the
throttle
stop
screw.
0:::-
-
a
•
-
-
-
Fig. 8 -17
4.
Turn
the slow adjusting screw in or out
1
/8
turn
each
time
and
when the idling
speed reaches its maximum
and becomes
stable, stop turning
the
screw. Adjust the
throttle stop
screw
once again, and
set
it
so
that
the
engine
idle
at
1, 100
r.p.m.
5.
6.
Back
off
the
slow adjusting screw
1
/8 turn.
Ride
the snowmobile to test the engine performance
start
dash,
acceleration and
idling
speed
.
If
the
engine
is not
so
responsive
to acceleration, the fuel-air mixture
may be too
lean.
If
the engine runs roughly, the
mixture may be too rich. The carburetor
should be
readjusted.
Main Adjuster Adjustment:
The main adjusting-screw
is
used
to adjust the
air-fuel
mixture when the
snowmobile
runs
at
high-speed.
Adjust-
ment should be made so that
the mixture becomes as rich
as possible, provided that the
engine still
runs
smoothly.
(This is necessary
to
prevent
engine overheating.)
-
_,
-
-
-
-
-
Fig. 8-18
\
'
u
For adjt1stment, follow the
foll
owing
steps
:
1.
First, back
otit
tt1e mair1 adjustir1g
sc
rew
as
specifi
ed
.
2.
To
adjust
tl1
e
n1air1
adjusting
screws, run
the
snow-
n1obile
at t1igt1-speed ar1d
find
tl1e rar1ge
of
selting
posi-
tions
(number
o
f
turns ou
t)
at
wt1icl1
tl1e
er1gi
ne
runs
clear1ly.
Set
tl1e
111ain adjt1st
ing sc rew
t
o
a
pos
it ion
where the ri cl1est practical
n1ixtt1re is obtained.
For
this
adjustmer1t.
the
rnair1 adjustir19
screw sl1ould
be
turr1ed
1/8
turn
or
less eacl1
t i1
11e.
3.
To test lt1e
engine,
qui
ck
ly
bring
tl1e
throttl
e sl1
L1tter
to
full -oper1
tror11
idli119
posi
t
iori
arid
acceleration
tl1e
s11owr11obile.
T heri,
watcl1
tl1e
perfo rn1ance
of
er
1gine
•
operatron.
4
.
After
run11ir1g at
high -speed,
cl1eck
tl1e
spark plug for
colo
rati
on
for an
ind
ication of
carbL1
retor
m ixture
.
5.
Run the snowmobile at
h
igl1-speed,
and
test
if
'tl1
e
engir1e will
pic
k
t.1p
speed
smoothly. Rep
ea
t the
adj
ust-
m ents
as specified
in
1
-
2
if
necessary.
Note:
When the snowmobile is
used under
severe
cor
1
dition
the f
ol
lowing
spark
plugs
may b
e selected
:
NGK B-7ES,
B-8ES
o
r
Champi
on
N
-3G
for
SL292C
Champion
N-3G
or Champion
N-2G for GP292B.
Standard
Sparl<
Plug
SL292C
NGK
B-7ES
GP292B
Ch
ampion
N-3G
-60-
•
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