I read endlessly about CV carb coughs. Here's what worked for me, on the cheap (which is my religion). After buying a 2000 Dyna Wide Glide a year ago for half price from an unemployed friend who was moving in a hurry, I started to work on the low speed (and dangerous) carb cough. You know, one of those that gets you while low-speed turning. It idled pretty good, and ran cheetah strong, with some backfiring. My friend had bought it from original owner who had added a cam, intake, Vance & Hines. My friend had a skilled private mechanic work on it. While he could get most of the cough out for a while, it was still there, and would get worse whenever it sat. The air/fuel mix screw access was already drilled out. I adjusted it up and down numerous times. Slight help when I richened it a turn. Dealer said carb is beat, wanted to sell me an aftermarket carb, $450. No way. Read about the drilling, washers, etc. But here's what worked for me, completely curing the cough and backfiring. 1. Drive that thing. CV hates being ignored. 2. Lucas gas treatment, half small bottle every other tankful. About $5 per bottle. 3. BP regular, and nothing else. 4. Take off carb, put on glasses and clean it like you love it. 5. Go up one on the main jet. In my case, it was going up to a #50, which is apparently the end of the line. (The number is stamped on the jet.) Cost, $4.25, Departure Bike Works, Richmond, VA. 6. Adjust air/gas mix screw back to stock-plus. (All in, then out two turns.) 7. Over the next several rides, adjust that screw until it's right. Smell it. 8. Keep riding that thing. I've had the pleasure of riding many bikes. This is the sweetest-running, best-starting (even at 10 degrees F), strongest-running lightly modified Harley I've ever twisted. Best of all, $4.50 versus $450.