LOCATING
AND
RECTIFYING
POSSmJ
..
E
TROUBLES
TROUBLE
Pailur,
to
Start.
Erratic
Slow
Running.
Loss
of
Power.
B,ccessit11
Oil
Consumption.
Bngin, Runs
Harshly.
Bngin,
Cuts
0Ht
at
Larg, Throttlt
Op,nings.
POSSIBLE.
CAUSES.
Faulty plug. Faulty
H.T.
lead.
Contact breaker points
diny
or
out
of
adjustment.
Pick-up brush worn
or
broken. Slip
ring oily.
Failure
of
petrol
to
reach mixing
chamber.
Broken
Throttle
Wire.
Pilot adjustment requires re-setting.
Worn inlet valve guide.
Faulty valve seats.
No
tappet clearance.
Exhaust valve lifter holding valve off
scat.
Front
chain too tight.
Loose
carbon wedged
on
valve seat.
Broken piston rings.
RBMBDY
Remove plug, place plug body
in
contact with cylinder, revolve
engine.
If
blue spark
of
fair
intensity
occurs,
plug
and
ignition
O.K.
If
no
spark, change plug,
and
if still
no
spar~
remove
flug
from
H.T.
lead, hofd
end
o lead
¼"
from
cylinder
and
revolve
enp.
In
the
event
of
there being still
no
spark,
examine contact breaker points
and
check their gap.
&amine
pick-up
brush and
dean
slip ring.
Ensure
that
~l
is
flowing
down
feed pipes. Clean carburetter.
Ensure
that
throttle slide rises as
twist grip
is
revolved.
With
throttle about
¼"
open
and
air closed, adjust pilot
screw
until
good idling is obtained.
Remove valve spring
and
test valve
for side play
in
guide.
Examine
and
re~d
as
necessary.
Cleek
and re-set as required.
Ensure
that
there is
some
movement
in
cable before lever begins
to
lift
valve.
Adjust.
Can usually
be
removed
by
kicking
engine over a few times. ·
Earnioie and replace
as
required.
If
accompanied
by
black smoke from Examine
and
make necessary replacc-
exhaust, broken piston rings, worn ments.
rings
or
barrel
Oil
pump
not
returning.
If
unaccomJ?3Died by exhaust smoke,
faulty
011
pump
timing cover
connection.
Mag. chain too tight.
Dirt
in carburetter.
37
With
engine running an intermittent
stream
of
oil
should
be
seen
upon
opening oil tank filler cap.
Ensure
that
the
necessary
pressure is
generated between timing cover
3Dd
oil
pump
nipple fibre washers
as
instructed in
para
21.
Adjust as
in
para. r,.
Cean
and
re-adjust.
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