NOTE:

These are the equivalent heat ranges found through track and dyno testing, they will not necessarily match the manufacturers listings.  They almost certainly do not do their testing in Adelaide, Australia !!

All above are not guaranteed 100% correct, but to the best of our ability they are as accurate as any other tests done.

We are always being quoted dyno test results , and just as jets can alter from one location to another so too can spark plug heat ranges and even types.  Please always be careful with what your dyno centre tells you and re-test for yourself at the track. 

The new NGK Iridium spark plugs are not included in any of our charts or suggestions.  Their EV / EGV ranges have proven far more suitable and reliable in all of the 2 stroke applications we have come across.  This will possibly change in time,  but for now we have not tested them successfully. 

And to answer your question  'What does IWT use in their engines ? ' ---  it is
 
KT100S  Clubman Heavy ......... sprint  B9EGV / B95EGV
KT100S  200 Twin Clubman ..... sprint  B10EGV or B95EGV
KT100J  National Heavy ........... sprint  B9EGV / B95EGV or W07CS
KT100J  rookie/ midget   ........... sprint  B9EGV
YZ80   80cc Superkart ............superkart  B10EGV / B105EGV   
FR125MAX Rotax  .................. superkart  B95EGV or  IW27 or  IW29 in summer 
                     ditto       ........ sprint B95EGV or IW27              ( we NEVER use NGK Iridium in the 125 Max )              

               And all of which are dependant always on the weather of the day !!!!

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