Some of you may remember I thought my engine had a rod knock awhile ago. It was making a really ugly knocking noise everywhere I went. It turns out this noise is actually backfiring through the carburetor, I witnessed it today while I was fooling around with it (Naturally while I was standing over it). The problem is very consistent, it backfires everytime I move off idle and continues to backfire at any speed on throttle. It was so regular I thought something must be knocking, but NOPE. What could cause this? My timing is at 12 btdc and I don't see any broken valve springs. I haven't touched the valves or anything lately, and they aren't making any discernible noise. Fuel pressure is good, vacuum is 18. I used to hear the same noise when I would really punch it, never figured out what it was, but it mostly disappeared when I increased my fuel pressure a little bit. Is anything in an eddy 1405 carb known for causing this?