Filter
Top Products
20
Engine
Tractors,
Lawn
a nd
Ga
rd
e n -
110
and
11 2
25- 8
General
Information
-
Tecumseh
S
M-2
059-
(Apr-
57
)
En
gi11e
Knocks-ConLinued
Cra
nkcase
low
on
oil.
Fill
crankcase
to
proper
level.
Change
oil
if
tractor
has
been
operated
8
hours
since
last
oil
chan
g
e.
En
gi
ne
Backfires
High
speed
and
idle
mixture
needles
not
prop-
erly
adjusted.
Adjust
needles
properly.
Loose
cylinder
head
or
blown
head
gasket.
Torque
head
bolts.
Replace
head
gasket
if
necessary.
Intake
valve
sticking
in
g
uide.
Free
valve
stem
in
g
uide.
Ignition
out
of
time.
Set
engine
timing.
E
ngi
ne
Low
on
Power
at
Hi
gh
SP
eed
Restricted
air
filter.
Clean
and
check
air
filter
element
condi-
tion.
Repbce
filter
if
necessary.
Spark
plup;
fouled
or
pitted,
incorrect
gap.
Check
spark
plug
condition.
Clean
and
regap.
Replace
spark
plug
if
necessary.
Incorrect
spark
plu
g.
Install
correct
plug.
Restricted
exhaust.
Repair
and
clean
muffler.
Repl
ac
muffler
if
necessary.
Breaker
points
out
of
adjustment,
worn
and
pitted.
Clean
and
adjust.
Replace
points
if
necessary.
Clogged
fuel
line
or
air
lock.
Clean
and
bleed
air
from
fuel
line.
Replace
fuel
line
if
necessary.
Broken
choke
cable.
Replace
cable
and
adjust
choke
valve
to
correspond
with
control
on
panel.
Clogged
breather
assembly.
Clean
breather
a
ssembly.
Install
new
parts
as
ne
cessa
ry.
Litho
in
U.S.A.
De
fective
ignition
coil.
Ch
e
ck
co
il.
Re
pla ce
co
il
if
ne
ces
s
ary.
En
f5ine
Does
N
ot
Ma
i
ntain
ons
tant
SP
ee
d
(surges)
High
spp('d
and
idle
P1ixture
neeellE'.-.
not
prop-
erly
adjusted.
Adjus
t
needles
prope
rly.
Spark
pl
ug g
ap
incorr
ec
t.
Check
s
park
pl
ug
condition.
Cl
e
an
and
r
egap
s
pa
rk
plug.
Install
new
s pa
rk
plug
if
ne
c
essary.
Throttle
to
governor
linkage
not
properly
;1·
C
;.
sembled.
Assemble
linkage
correctly.
Breaker
points
out
of
adjustment,
worn
or
pitted.
Clean
and
adjust.
Replace
points
if
necessa
r
y.
Dirt
or
water
in
fuel
system.
Remove
fuel
system
and
cl
e
an
dirt
and
water
from
sy
s
tem.
Install
ne
w gas k e
ts.
Install
carbu
r
et
or
kit
if
necessary.
Engine
Uses
Exc
es
sine
Amounl
of
Oil
Clogged
breather
a
sse
mbly.
Clean
br
ea
ther
a
ss
e
mbl
y.
Replace
parts
as
nec
es
sary.
Br
ea
ther
not
as
se
mbled
properl
y.
Assemble
breather
pr
o
perly.
Worn
or
broken
piston
r
ings.
Install
new
rings.
Worn
cylinder
b
ore
.
Recondition
cylinder.
Replace
parts
as
necessary.
Clo
gged
oil
holes
in
piston.
Cl
ea
n
piston
and
check
piston
condition.
Install
n
ew
parts
as
n
ce
ssa
r y.
Wr
o
ng
size
piston
ri
ngs .
Install
proper
r
ings.
Wor
n va
lve
st
e ms a
nd/
or
val
ve
guide
s .
Che
ck
condition
of
v
al
ve
st
e ms a
nd
g
uid
s .
Re
p
lace
va
l
ves
and
gu
id
es
if
nc
~c
es
s
ar
y
.