Id say it needs probably a good gallon through it before you really start to see what the motor is about. Around 4 liters in a gallon.

I noticed once I got it to be able to run on the straight with overly rich settings without flaming out this was when the motor became ready to tune to max power. Otherwise it would flame out a bit if I didnt have the tune just right and even then I believe its setup to where it cant run right until this point. So its rich and boggy for a little , usual for break-in. But if you tried to lean to early this would also cause it to flame out.

Once I got it to run rich at wot, this was when I was also able to lean it proprely to get it to run incredibly.