Novarossi's come pre-tuned ready to run in, and require very little leaning out through the running in process to be singing on top-note, and perform amazing when at top-note.
Therefore - whatever is on the engine from the factory, is what I would start with and intend to continue with. Changing to Turbo head may make it harder to find the peak performance.
I have a Novarossi NN21R and Plus-4c, and the above is what I have done. I haven't even changed venturies - just trust the factory settings. They're bleedin' awesome engines.
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