Ok here's the deal.Tried to make a search bur couldn't find an answer. I'm buying a coolhead and I'm wondering what size of domes would be safe. Stock motor, no port and will have a set of pro circuits pipes on. I'm at sea level and I ride mostly on 87 octane. There is no way I can get better gaz than that where I ride sometimes and I don't want to bring some octane booster with me. Do you think it would be safe with 21's or 22's is the only ones safe? I think stock is around 23cc if I calculated right.
Thanks