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7.1
ENGINE
103
7. TROUBLE SHOOTI G
It is
most
important
that
the
cause o
any
trouble
be located as
soon
as
pcSSI:::·e
~d
' he
o·ooer
corrective
action t
aken
so
that
the
serviceable
li'
e
of t
he
engine will be
extended.
In
the
following
table
ore
listed
the
troub
les, probable causes and
t he
corredi
e
:::::-·:::-s..
1.
MAIN ENGINE
TROUBLE
Troubles
Engine
will not
continue
running.
Engine malfunctions
aher
warm-up
.
Excessive
smoke
at
high
engine
speed.
(oi
l
pump-
ing condition)
Noise produced near
the
top of t he engi
ne
Overheating
engi
ne
Engine
does
not
sta
rt
!lack of
compression)
Probable
causes
1. Clogged
fuel
cock.
2.
Plugged
vent
hole
in fuel
tank
cap.
3. Improper tappet clearance.
4.
The
carburetor
to
intake
manifold
con-
necting
tube
damaged or leaking air
at
th
e jo
i
nts.
5.
Improper o
il
level
1.
Defective
spark
plu
g
2.
Defective
ignition
coil
3.
Incorrect flat
lev el
1. Oil
being
pumped
into
the combustion
chamber due
to
excessiv ely
worn or
damaged
cyl
inder,
piston,
rings
a
nd
burned during
combustion
.
1.
Worn piston and
cylinder
The
clearance
between the piston and
cylind
er is
increased
ca using
the
pisto
n
skirt
to
slap
agai
nst cylinder wall during
combustion.
2.
Wo
rn
connecting
rod large
end pro
-
duces knocking
3.
Tapp et
noise
1.
Carbon deposit
accumulati
on
2.
Dirty or fouled
spark
plugs
3.
Improper type
spa
rk plugs
or gap
4.
Insuffi
cient
lubrication
to
dri
ve
chain
o
r
chain
tension
too
tight.
5
.
Oi
l
l evel
too low,
poo
r
o
r
i
mproper
grade oi
l
6.
Improp
er
distributor point gap c
lea
r-
anc
e, dirty,
burnt
7.
Excessive carbon
accumulatio
n in
com-
bustion
chamber
1.
Foreign object caught
between valve
and valve seat
2.
Tappet
stuck open
4. Ignitio
n
timing out
of
ad
justment
5.
Blown fu
se
Corr
ective action
Clean
and
inspect.
I
.
Overheo
ed
spark
p lug,
replace
lit
pluf;s
o'
correct
heo range
By
diagnosing
the
noise,
rebo
re
a
d,
e>r replace the
pa
rts
as
requi
red.
I
.
Inspect
and rebore cylinder and
replace worn
parts.
2
.
Replace
connecti
ng
rod,
large
end bearing and
crank
pin.
3.
Adj ust to
proper
specification.
1. Disassemble
and
c
lean
2.
Clean,
d ry
fo uled
plugs.
Inspect
carburetor
if
pi gs
con-
tinues
to
foul.
4. Adjust
pe
riodical~{.
I
o•icote
7.
Adjust
period'ccll-f
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Troubleshooting
