No! Your running to rich.

Break the engine in before you try to run it inverted, with the stock muffler.

Pitt's mufflers are also notorious for not providing enough muffler pressure. If your tank is too high this might be a good thing.

Break-in setting should be around 2-1/2 turns. Once your broke in you need to address the LS needle, then you can deal with the pitt's