Rotax Max NGK B10EGV/5927 & B11EGV/5831

I have over 20 brand new NGK B10EGV/5927 & B11EGV/5831. Will they work on a non-EVO Rotax max?

They’ll work but the 11 might be a little cold and more likely to foul.

Little research and B10EGV seems to be similar to the Denso IW31, and the B11EGV is similar to Denso IW34. So Based on this Chart it seems as though NGK B9 or Denso IW27 is the sweet spot?

1 Like