Motobecane 40 - Page 85

MOTOBECANE TROUBLE
SHOOT
I
NG
GU
I DE
ENGINE, CONT'D.
III.
GOOD IGNITION
SPARK, BUT THE ENGINE
WILL
NOT START
A) Decompression valve cable
adjusted
too tight
B)
Restriction
of
fuel flow
(Ex.
fuel
tap,
fuel tank,
fuel
Jine,
carburetor)
C)
Faul
ty
head
gasket
D)
Ignition
timing
incorrect'ly set
E)
Faulty inlet
pipe gasket
F) Exhaust
port
and
exhaust
pipe
clogged
IV. ENGINE RUNS, BUT
HAS
A
HIGH SPEED
MISS
Faulty
or worn spark
plug
",:
.
Improper ignition
timing
Faulty radio
suppressor
Faulty
high
tension coil
Faulty
or worn
ignition
points
and condenser
Faul
ty
head
gasket
Decompression
valve
cable adiusted
too tightly
Ai r I eak
between i nl
et
pi pe
and
cy'l
i nder
Exhaust system
clogged
V.
ENGINE RUNS, BUT
HAS
LOW SPEED
MISS
VI. ENGINE
POPS AND BACKFIRES- WHEN TRYING
TO START
A) Ignition timing
improperly set
B) Decompression cable adjusted
too tight
C)
Faulty
cylinder
head
qasket
D)
Faulty
ignition
points
or
condenser
VII. DIFFICULT
TO
START
WHEN COLD
A)
Carburetor choke
valve
not
functioning
sufficiently
B) Improper ignition timing
VI I
I
.
DIFFICULT
TO START
WHEN
WARM
A)
Improper
ignition
timing
B)
Worn
out
spark
pl
ug
C)
Exhaust system
clogged
D)
Faulty ignitjon
points
and condenser
t/
A)
B)
c)
D)
E)
F)
c)
H)
r)
A)
Improper spark
pl
ug
B)
Improper ignition
timing
C)
Faulty
or
worn out ignition
po'ints
and condenser
D)
Faulty radio suppressor
(spark plug
cover)
E)
Magneto rotor rubbing on
internal
coils
R0
81