......
<.!'
+
Tro ubl e
Engine
knocks
Engine ope
rat
es well
at
high speed but
ba
c
k-
fi
res
at
averaJ:!e speed and dies
out
at
low speed
Engine
fa
il
s to develop
full power (insuffici
ent
"traction", when
thr
ottle
is
fu
ll
y opened, motorcycle fa-
ils to devel
op
sufficient ac-
ce
leration)
..
Cause
7.
Carburettor maladjusted
8.
Piston rings burnt or
broken
9.
Valves loosely filled to
their
seats
due to
great
anw-
unt
of
ca
rb
on
l.
Ear
ly ignition (above
permiss
ibl
e)
2.
Eng
in
e overheats
3.
Piston
pins, piston
s,
cy-
linders, connecting rod bush-
ings, crankshaft bearings
worn
oul
I. Idl
ing
jet clogged or mal-
adjusted
2. Carburettors maladjusted
( carburcllors operation not
s ynch ron ized)
3.
Clearance betw
ee
n valve
and
rocker end is incorrectly
sel
l.
Late ignition
is
set
or
breaker
gap
too sma
ll
2.
Air cl
ea
ner or a
ir
hole
in
petrol
tank
p
lu
g
clogg
ed
Symptoms and
fault
t
racing
7.
Opera lion of cylinders
not synchronized
8. Bad compression,
eng
in
e
smokes and splashes p
lu
gs
wi
th
oil
9.
Insufficient
co
mpression
I.
Knocks disappear
at
l
ate
ign ition
2.
Hot
sur
fa
ce
ignition
be-
gins to take place
3.
Faults to be traced by
li
steni
ng
lo the engine
2.
Faults to be located by
l
is
t
en
ing to eng
in
e
3. Check the size of clear-
ance
wilh a feeler. Cl
eara
n
ce
must be equal to 0
.07
mm
wi
tl
1
engine
co
ld
I.
Po
wer increases
at
early
ignition
•
6
Continued
Remedy
7.
Adjust
the ca rbur
ettors
8. Repair
th
e
eng
ine,
cl
ea
n
or repair the rings
9.
Repai1·
the engine, clean
off
ca
r
bo
n
and
lap the valves
I. Adjust ignition
2.
Stop
th
e engine
and
al-
low
it
to cool
3. Repair the engine
1.
Adjust idling
and
blow
air through the jet
2.
Adju
st
ca
rburettors for
sync
hr
onous operation
3.
Adjust
the clearance
in
valves
I.
Set ignition correctl
y.
Check breaker
gap
2.
Remove
and
wash out the
air cleaner with kerosene
an
d
fill it wilh motor oil, clean
out
th
e hole in plug
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