Re: Regular v premium
Hi Nevada. I broke my new engine in running opti 2 @ 80:1 from the get-go for half a tankful (approx. 1/4 gallon) then went directly to a 100:1 mix. Over 200 miles on this mix my plug is a perfect golden-brown and the engine runs surprisingly cool. I suggest raising the c clip position on your carb needle (and possibly going with a smaller jet size) because running lesser amounts of oil per gas ratio makes the mixture richer (more gas in a given gallon).