Quote Originally Posted by RickP View Post
I think I heard the pop your referring too in the above vid. Right when before you said "backfire". Where do you have your O2 sensor located? I originally located mine in the header which turned out to be a big mistake. After relocating to the side pipe collector, my motor smoothed right out.
Interesting. I do have the o2 sensor in my header. What engine are you running? I go-karted today and there were no pops or crackles. https://www.youtube.com/watch?v=drbqYCAAKQQ

On a separate note I am leaking power steering fluid and oil. I will address both of those leaks before I run it again.