MAN048 ING
31
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 against battery polarity reversal. When
reversing the connectors on the battery, the protection circuit activates the
fuse as soon as the key is on KEY or RUN position. The fuse must then be
replaced.
11) Replace the fuse after having disconnected both terminals on the battery.
Only use 5A strip fuse. Use of fuses with higher amperage might damage the
electronic box whenever the battery polarity is reversed.
12) Only use sealed lead type batteries as specified by IAME. Only use 12V. batteries.
13) Always disconnect the battery from the electrical system when recharging the
battery with an external battery charger, otherwise the internal voltage regulator
could be damaged.
14) DO NOT connect batteries in parallel; this might cause explosions and damages to
the operator. The recharge of the battery, in normal conditions, is guaranteed by
the electrical system. A few minutes of engine in operation are sufficient to recover
the energy lost when starting the engine.
15) In case the battery must feed other users (Tachometer, Telemetry etc…), first
contact IAME to check the recharge capacity of the system.
16) Modifications, interventions and additions to the original electric system might
cause malfunctions. No obligation of IAME exists in this case.
15 SPARK PLUG AND THERMAL DEGREE
The engine is supplied with a standard
NGK BR10EG
spark plug which represents a
good compromise between the needs of a good breakin and the racing needs in
normal conditions.
Use of different spark plugs is possible and, as a general information, we are attaching
a correspondence list among spark plugs of other brands based on
thermal degree
which represents the capacity of the spark plug to dissipate the internal heat. The
colour of the various parts of the spark plug more exposed to the combustion flames
gives a good indication on the adequacy of the thermal degree and on the carburetion.
It is necessary though to understand which of the two parameters has to be changed
and only the experience tells how to identify the most proper thermal degree of a spark
plug as lean or rich mixtures can generate the same final look which can also be
achieved with a hot or cold spark plug.
See table:
An excessively warm spark plug shows the
symptoms listed aside
ATTENTION:
Always use a warmer than standard spark
plug with cold or rainy climates.
§
Extremely clear color, porous look and
calcification of the electrodes and of the internal
insulation.
§
Irregularities in the ignition, preignition and
detonation with tendency to perforate the top of
the piston.
§
Note: Some of these symptoms can be
achieved with lean mixtures.
A correct thermal degree shows:
§
Colour of the insulator end from yellow grey to
dark brown for mixtures respectively lean or rich.
