I swapped an Evo CV onto my 74" Shovel. It starts and runs fantastic, except for a low speed ping I can't get rid of. It happens just as I'm pulling away from a stop sign, or in other very low RPM/high load situations. I've had my tuning all over the board, currently my jetting is 48/190, 2 shims under the needle, stock slide and spring. My mixture screw is spot on, if I up the pilot jet, the screw says it's to rich. No vacuum leaks that I can detect. My plugs look like they should and it runs just about perfect otherwise. Any suggestions?