Today I just bought a Hero Panther. She is in very good shape but is running a little funky. My first project is to find a spark plug and I am having a difficult time of it. This panther has a ATLAS spark plug #481. And no auto parts in town can seem to cross this number. So my question is what common plug can I use in my Panther? I not look for a turbo plug just something that will keep her tuned.