Basically the US is about the only place I can think that that still allows lead. Even in the 90’s unleaded was the norm for karting in Europe… Certainly from memory it was gone by the mid 90’s. It’s kinda incredible it’s been allowed fly radar the radar in karting. I won’t pull this topic too far off track and instead link to another topic on TEL:
In general, additional octane won’t hurt anything. A couple of common myths that get repeated are that higher octane fuels burn slower and/or cooler. Neither are true.
Welcome Theo. Can you clarify what fuel you’re using and/or the octane rating type?