There are a couple schools of thought on break in. I just went by the instructions that came with my vehicles.
Basically running the first two tanks really rich, and easy on the throttle, lean it out a bit, and run two more tanks. letting the engine cool between runs. Then you can start to tune for power. I did my buggy in one afternoon... Seems to run just fine.
There's another method called heat cycling, I'm sure a search would turn up plenty of info. I know there's a bunch of videos on youtube.
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