Yes regular gas. Premium is a rip-off but ppl can't/won't believe it.I can't imagine that happening unless the controller is insane rich.
Carrying a spare plug or two around until you can get things ironed out might be a good idea.
Are you using regular gas?
I've seen premium cause a bunch of carbon buildup on a street bike exhaust when the bike only required regular.
Yes regular gas. Premium is a rip-off but ppl can't/won't believe it.