8.
TROUBLE-SHOOTING
The following three conditions must be satisfied for satisfactory engine start:
1)
The cylinder filled with
a
proper fuel-air mixture
2)
An appropriate compression in the cylinder
3)
Good
spark at correct time to ignite mixture
The engine cannot be started unless these three conditions are met. There are also other factors which make
engine start difficult, e.g., a heavy load on the engine when it
is
about
to
start at low speed, and
a
high back
pressure due to a long exhaust pipe, just to say a few,
The most common causes of engine troubles are given below:
8-1
STARTING
TROUBLE
Trouble
No
or little
spark
Cause
I
Remedy
Spark plug defective
I
(1)
If spark plug is dirty, clean it well with gasoline
or polish it with sand-paper. Remove foreign
matter if any.
(2)
Adjust spark gap to
0.6
-
0.7
mm.
(3)
If spark plug hasfaulty instulation due to
breakage, replay it with a new one.
High-tension cable
together.
defective
If defective, replace the cable and ignition coil
Contact breaker
defective
(1)
If points are rough, polish them with sand-
paper
No.
400.
(2)
If point gap is wrong, loosen contact mount
screw, and adjust it to
0.35
?
0.05
mm.
Also
adjust ignition timing if possible.
(3)
If ignition timing is wrong, adjust it to
23'
f
2'
before top dead center.
(4)
If breaker has faulty insulation, replace
the breaker with
a
new one.
(5)
If capacitor is defective, replace
it
with
a new one.
Preventive hints
(1)
Use a spark plug of the speci-
fied heat value.
Do
not use
low-quality oil. Clean the air
cleaner to prevent dust from
entering.
center pole or forcibly twist
it in adjusting spark gap.
Otherwise, insulation breaks
down.
(2)
Be carefid not to strike the
-
16
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