This is one of those things that can onle be answred by listening to the engine. If you don't know, get somebody that has messed with these gas engines to help you. You do not want to run it lean...especially during break-in. I could take a guess myself, but without listening to it that all it would be...a guess. Best thing to do is to get some help from somebody who can tell by listening. That is a good engine, and the reason I wrote this is to make sure nothing happens to it. I could tell what it's doing in 10 seconds, but I'd have to hear it, and see the way it was taking the throttle and what it sounded like at mid. It could be something as simple as you are idling it too low righ now. They will idle lower after the breakin process than they will when new and tight. Whatever you do end up doing though, make absolutly certain you don't run it too lean during the breakin. You wanna go easy on them when they're new, and they'll breakin and run like hell down the road! hehe