im new to niro but not to rc cars would love to know factory setting on my old rx 21 race nova rossi carb that is also on a hyper 21 pro 8 port tuning is real annoying very keen to learn

Here is how I have always done it, well first it depends on how many needles you have, if only 2 back them both out until they are flush with their housing, then turn them in 1 1/2 turns, that is going to be extremely rich, it is a safe pace to start with on any engine, if you have 3 needles, don't adjust the 1 on the carb slide where the servo connects, until the other 2 are tuned properly, remember richer is better, keeps the engine cooler.

check that the low end needle only a 1/2 turn sorry wasn't thinking