Hi, I recently acquired a ONE 2025 edition engine, but I have a question. I noticed that the high-speed needle is very short. In all my engines, including the R21 Shimo and the R2106, it takes 5 turns from flush to close, both of them, and the ONE only takes 2 turns. Is this normal? Can someone clarify this for me, please? Thank you.

Is it important to know? As long you can tune the engine to the right performance and keeping it stable I do not care about needle length and factory settings

thank you for for reply 🙏

the problem is that it remains super rich even when closed, closing the needle all the way still lets in a lot of fuel, maybe I have to move the mixture control valve to reduce the fuel intake, I wanted to know if anyone has a same engine that can tell me how to do it…

In that case I would contact the shop where you bought it or even try to contact Capricorn directly.

I agree with this... I have never seen a carb that went from 0 - 100% in two full turns. Post the answer after you email Capricorn I would be interested in what the remedy was.