MAN048ING31
9) The digital assembly needs use of a resistive spark plug cap or spark plug. The
resistor value must be equal or higher than 5 Kohm. Avoid use of resistive H.T.
cables.
10)The electrical system is protected ag ainst battery polarity reversal. When
reversingtheconnectorsonthebattery,theprotectioncircuitactivatesthe
fuseassoo nasthekeyisonKEYorRUNposition.Thefusemustthenbe
replaced.
11)Replace the fuse after having disconnected both terminals on the battery.
Onlyuse5Astripfuse.Useoffuseswithhigheramperagemightdamagethe
elect ronicbox wheneverthebatterypolarityisreversed.
12)OnlyusesealedleadtypebatteriesasspecifiedbyIAME.Onlyuse12V.batteries.
13)Always disconnect the battery from the electrical system when recharging the
battery with an external battery charger, otherwise the internal voltage regulator
couldbedamaged.
14)DONOTconnectbatteriesinparallel;thismightcauseexplosionsanddamagesto
theoperator.Therechargeofthebattery,innormalconditions,isguaranteedby
theelectricalsystem.Afewminutesofengineinoperationaresufficienttorecover
theenergylostwhenstartingtheengine.
15)In case the battery must feed other users (Tachometer, Telemetry etc…), first
contactIAMEtochecktherechargecapacityofthesystem.
16)Modifications, interventions and additions to the original electric system might
causemalfunctions.NoobligationofIAMEexistsinthiscase.
15 SPARKPLUGANDTHERMALDEGREE
TheengineissuppliedwithastandardNGKBR10EG sparkplugwhichrepresentsa
good compromise between the needs of a good breakin and the racing needs in
normalconditions.
Useofdifferentsparkplugsispossibleand,asageneralinformation,weareattaching
acorrespondencelistamongsparkplugsofotherbrandsbasedonthermaldegree
which represents the capacity of the spark plug to dissipate the internal heat. The
colourofthevariouspartsofthesparkplugmoreexposedtothecombustionflames
givesagoodindicationontheadequacyofthethermaldegreeandonthecarburetion.
Itisnecessarythoughtounderstandwhichofthetwoparametershastobechanged
andonlytheexperiencetellshowtoidentifythemostproperthermaldegreeofaspark
plug as lean or rich mixtures can generate the same final look which can also be
achievedwithahotorcoldsparkplug.
Seetable:
An excessively warm spark plug shows the
symptomslistedaside
ATTENTION:
Always use a warmer than standard spark
plugwithcoldorrainyclimates.
§ Extremely clear color, porous look and
calcificationoftheelectrodesandoftheinternal
insulation.
§ Irregularities in the ignition, preignition and
detonationwithtendencytoperforatethetopof
thepiston.
§ Note: Some of these symptoms can be
achievedwithleanmixtures.
Acorrectthermaldegreeshows: § Colour of theinsulator endfrom yellow grey to
darkbrownformixturesrespectivelyleanorrich.
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