Wow, 8 to 1 ratio? That's gonna have a seriously tough time making it past the high and low needles on a Walbro carb. Probably have to open em to about what, maybe 5 turns out??
I've run a K&B .61 on 16-1 Belray oil. You sure?
Well, I'll try it. Guess I better buy stocks in NGK ME8 sparkplugs. LOL

John