Discussion Starter · #1 ·
Just recently put curtis sparks exhaust on my 07 400 ex. It has a 168 main and a 42 pilot and my needle valve was not adjustable. I took a needle valve out of another 400 that was adjustable and it is on the 3rd notch. Fuel/mix is 3 1/2 out and now it is really really cold natured. I have to choke it and let it run a while while i give it a little gas. When i warms up its fine. Before when a had the hmf slipon with the 42 pilot never had to use thew choke at all. Was thinking bout taking the choke off but I would never get it cranked then. What is my problem or is this normal when I go to full exhaust? Why wasnt my needle valve adjustable(no way to move the groove on a 07)?