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20
Engine
Tractors,
Lawn
and
Garden
-
110
and
112
25-6
General
Information
-
Tecumseh
SM-2059-(Apr-67)
Engine
Runs
But
i
Hisses-Continued
Breaker
points
out
of
adjustment
or
worn
and
pitted.
Clean
and
adjust.
Replace
points
if
necessary.
Spark
plug
fouled
or
pitted,
incorrect
gap.
Clean
and
regap
plug.
Replace
plug
if
necessary.
Incorrect
spark
plug.
Install
proper
plug.
Loose
electrical
connections.
Tighten
connections
.
Carburetor
float
not
properly
adjusted
or
hole
in
float.
Check
condition
of
float.
Adjust
float
to
proper
position.
Replace
leak
y
float.
Dirt
or
water
in
fuel
system.
Remove
fuel
system
and
clean
dirt
and
water
from
system.
Install
new
gaskets.
Install
carburetor
kit
if
necessary.
Wrong
valve
clearance.
Check
valve
clearance
and
valve
condition
.
Repair
valve
as
necessary.
Faulty
coil.
Check
coil
condition.
Replace
coil
if
necessary.
Engine
Misses
Under
Load
High
speed
and
idle
mixture
needles
not
properly
adjusted
.
Adjust
needles.
Spa
rk
plug
fouled
or
pitted,
incorrect
gap.
Check
spark
plug
condition.
Clean
and
regap.
Replace
spark
plug
if
necessary.
Incorrect
spark
plug.
Install
proper
spark
plug.
Breaker
points
out
of
adjustment
or
worn
and
pitted.
Clean
and
adjust.
Replace
points
if
necessary.
Ignition
out
of
time.
Set
engine
timing.
Dirt
or
water
in
fuel
system.
Remove
fuel
system
and
clean
dirt
and
water
from
system.
Install
new
gaskets.
Install
carburetor
kit
if
necessary.
Old
fuel.
Drain
system
and
fill
fuel
tank
with
fresh
fuel.
Linkage
misaligned
(throttle
arm
to
governor
arm).
Straighten
linkage
to
prevent
binding.
Engine
Will
Not Idle
Idle
speed
too
low.
Adjust
idle
screw.
High
speed
and
idle
mixture
needles
not
prop-
erly
adjusted
.
Adjust
needles
properly.
Dirt
or
water
in
fuel
system.
Remove
fuel
system
and
clean
dirt
and
water
from
system.
Install
new
gaskets.
Install
carburetor
kit
if
necessary.
Restricted
fuel
tank.
Replace
filler
cap
or
cap
gauge
assembly
.
Spark
plug
fouled
or
pitted,
incorrect
gap.
Check
spark
plug
condition.
Clean
and
regap.
Replace
spark
plug
if
necessary.
Wrong
valve
clearance.
Check
valve
clearance
and
valve
condition.
Service
valve(s)
as
necessary.
Low
engine
compression.
Check
compression.
Engine
Misses
I-!-
'
hen
Ad
v
ancing
Throllle
Cold
engine.
Choke
engine
before
advancing
throttle.
Litho
in
U.S.A.