An excessively cold sparkplug shows the
symptoms, listed aside.
ATTENTION:
Always use a colder than standard
sparkplug with hot climates.
?? Insulator end and electrodes covered with black
shady soot.
?? Ignition difficulties.
?? Note: a wet or oily electrode could also mean an
excessively rich mixture.
COMPARISON TABLE BASED ON
THE THERMAL DEGREE
HOT
BOSCH NGK CHAMPION
WO8CS BR9EG N54R
WO7CS BR10EG N52R
WO6CS BR11EG
COLD
14- CHOICE OF THE BEST SPROCKET RATIO
The life of an engine depends upon many factors but most of all upon the speed at
which the engine is operated. If an engine is normally operated at speeds higher than
what recommended by the manufacturer, the wears and stress of the various
components (con-rods, roller cages, bearings etc.) will be such as to drastically
reduce the life of the engine itself. It is therefore extremely important that the user
respects the operating limits imposed by the manufacturer.
The operating limit for the Leopard engine is 15000 RPM.
ATTENTION:
Never exceed the above limit. No obligation of IAME exists in case the above
limit is exceed.
In case the user wishes to optimize on the track the sprocket ratio in order to
achieve the best possible performance, without abusing the engine, follow the under
shown recommendations.
The engines are supplied with a 10 or 11 teeth sprocket (pitch: # 219).
Table 1 shows the various ratios between the sprocket on the axle and the engine
sprocket given the different axle sprockets.
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