Run it the way you're going to want to fly it from day one. Just like you would a chain saw you just bought and plan to use for work today. I don't know how all this "break in" stuff for gassers started, but it's a bunch of useless crock. We're not dealing with abc technology, tapered cylinders, or cylinder liners here.
FYI, with that Pitts plan on going through a lot more props than you anticipated. Don't ask[

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There's going to be some heat for this one. I feel it comin' already