I'm looking for advise, I'm stumped! I have a 2006 Street Glide with a CV40 carb on it. Jet sizes are 190 main and 48 pilot. Exhaust is stock with thunder slip on's. Air filter is K&N. Everything else is stock. I'm running the bike at 5000 to 7500 ft. I've cleaned carb, inspected all components, adjusted choke cable, and tried about every setting possible on the mixture screw. I still can't get the bike to quit popping through the exhaust when I let off the throttle. I would think my jets are plenty big enough, but I still seem to be running lean. I pulled the plugs and they both seem ok, light tan to white color and dry. I just don't get it, I can make it a little better with the mixture screw, but still not desirable. I was thinking about installing a Yost kit, but not sure if that will cure the problem. I don't want to waste the money on a kit, and end up with the same problem. I can't imagine that I'd need a bigger pilot jet? Could the MAP sensor be causing the problem? any thoughts?