Spark Plug Heat Ranges.
 
SILVERSTONE/BERU DENSO , ND NGK BOSCH CHAMPION
  B7EV N4G
S5 W22ESZU B8EV, B8EGV W08CS N3G
S9, S7 W24ESZU B85EGV W08CS
14Z-3CU Ultra W27ESZU , IW27 B9EV, B9EGV N2G, N86G
W29ESZU , IW29 B95EGV W07CS N59G, N84G
W31ESZU , IW31 B10EV, B10EGV W07CS N57G, N82G
W34ESZU , IW34 B105EGV W06CS
B11EGV W06CS
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
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 !!!!

Back to tech2.gif (1652 bytes) page              If you have any other queries, please call email.gif (1476 bytes)