I have an S&S 113 Sidewinder in my 98 Softail. I just rebuilt the topend and and have about 400 miles on the breakin.I just discovered that the timing was advanced way to far so I reset it. I have a Compu- Fire ignition and I set it to the lowest setting as instucted. It idles and runs great but I have a little backfire flame out the rear pipe of my Vance&Hines shortys.I have no exhaust or intake leaks.Feedback from anyone would be greatly appreciated.:eam:eam:eam