Difficult Ignition Or Ignition Failure; Lights Do Not Work Properly - Ducati 900SS Workshop Manual

TROUBLES AND REMEDIES
Some of the troubles which moy occur and the relevant cousese o re
listed hereunder.
Difficult ignition or ignition failure.
First
of
all check the gasoline level and whether the g asoline cock is
open lploced on the R/H side of fuel tonk). If everything is normal, the
following causes may hove occurred:
CAUSE
Gasoline pipes are clogged.
The fuel filter is dirty.
Gasoline cock filter is dirty.
Electric pump doesn't work.
The carburetor float is jammed.
The float has an hole.
The jet is obstructed.
Spark plugs ore dirty or defective.
There is no compression.
Lack of spark at spark plugs.
C.6
REMEDY
Clean them wi th on air jet eliminating
any extraneous body.
Replace the filtering element of the
50 me.
Oi50~semble
the filter and clean it by
on air jet on the wire gauze.
Verify all electric connections, and in
case replace.
Remove the float and clean the cham·
ber.
Replace.
Apply
a strong air jet into it in order to
free the passage.
Replace or clean the spark plugs
making
~ure
that the insula ting p iece
core is intact, that there is no carbon
deposits on the electrodes, and tha t
the gop between the electrodes is
0 .023 in .
Check whether the spark plugs ore
tight, that the valves ore well dosed,
and the perfect seal of the piston
rings.
Check that the key switch is not defec·
live; il so, replace.
C heck tha t the wires
of
the ignition
circuit ore w ell connected and no t
interrup ted; replace, the defective
w ire, if necessry.
CAUSE
Lock of spark at a single
s park plug.
Lights do not work properly.
CAUSE
Battery
is down or often runs
down.
REMEDY
R epla ce or dean th e spark plug a nd
check that the gop between elec·
trades is 0 .023 in.
Check that the wrre from the H .V. coil
to the spark plug is not interrupted or
does not spark externally; replace as
required .
Check that the wires connecting the
elec tronic control unit to the
H.V.
coil
are w ell connected and not inter·
rupted; when required replace the
fou lly wire.
C heck the proper electronic control
unit and H .V. coil operation replace
the defective item.
REMEDY
Check the condition of the banery,
and the recharge circuit.
Check the regulotore; if it is defective
it must
be
replaced being impossible
to repair il. Aller having detected the
defect, recharge the boN ery.
To check the recharge current oper·
ate ad follow s.
Disconnect the wire from term inal+ o f
the battery and place a direct current
ammeter between terminal a nd w ire
!possibly with 0 in the center).
Start the engine until a
~peed of 5000
rpm
i~
reached. The ammeter must
display the following values:
o) max. current- I 0 A if the battery is
(}
almost completely down; :
b) minimum current - I A i/ the battery
is completely charged.
According to the condition o f the
ba ttery charge, intermedia te values
o re recorded.
These tests must be carried out w ith
lights of.
Caution: the ammeter must
be
con·
nected always with the engine off.