I'm here too! If the ambient temp is below 10 deg c or you are running in very wet conditions the Denso IW24 is the way to go. It will bu cleaner at the bottom end. Remember blanking the rad will raise engine temp but the engine is sucking in air at the ambient air temp and it's this you are trying to ignite. Never fit an IW34 to a Rotax in the UK, 1 it is not on the gold book approved list, 2 I don't recall the UK ambient temp being above 32 deg C very often! The IW 27 is mor or less suitable for most conditions and is the supplied plug with a new motor, I generally carry 24. 27, & 29 in my tool box but I do stock IW 31 too but they tend to be in the dusty boxes at the back of the top shelf!
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