That's bad news Steve, I have just bought some jets for Mikuni Carbs and they are made of brass, as I suspect most carb jets will be.
I read on a Racing Fuels website *, that each Petrol/Avgas has a slightly different Specific Gravity, so in theory needs different jets... Maybe not such a problem on planes with Mixture controls, but do Rotax engines have a mixture control?
*
racing gasoline ? Speed Talk