Abuckner, i am flying an Excelleron 90 , and mine is powered with Magnum 120 4 stroke. I have fitted a TY1 spinner, size 3" or 75 mm, colour red , to match the fuse. This spinner now has done 2731 flights on my Excelleron, and all my starting has been with an electric starter, and still looks like new. It, the spinner, has an aluminum back plate, and the cone is plastic. Use a soft cup in your starter to help protect the spinner.
Bill