Ive had this engine since new. It has never run "good" in mid to low range. Throttle response is instant and top end is really good. When relativley new (1997 I think) I had a person at central hobbies tell me to enlarge the hole in the throttle valve. Its always ran really rich on the low end regardless of pressure. I did that and it has ran a lot better ever since but not perfect. Is there any way to put a low end adjustment on an older NC? OR does anyone have anymore ideas. I run type F plugs and 20+ nitro.

There is no way to add the low end adjustment. If it is still rich on the bottom end, the hole in the barrel can be enlarged a bit more.

What a neat and easy way to adj the low end. [&:]

Oh well.

Not too good, I will admit. That's why we don't do it that way anymore. This was long before my time with YS engines, and had I been around, it never would have been sold this way.