Originally Posted by Doug Bearden
I have an '07 Ultra Classic. Since it was new it has always popped on the de-acceleration. I have checked for air leaks and could not find any, but changed out my exhaust gasket any way with no luck stopping the popping. I put a power commander on it, had it dyno several times with no luck. I get good mileage. My freinds say they see fire out the pipes when it pops. I have recently put triple 7 cams in and that made it worse. Any suggestions. Could the valves be the problem?
The valves aren't likely the problem. If you didn't retune after the cam change you should. You could try one of two things to get rid of the popping:
1. In the 0% column of the Spark Advance tables (both), increase the value by 5° in the RPM range you have the popping. I haven't tried this technique but some say it often works.
2. Increase the values in both Fuel Adj. tables in the affected areas of 0% TP in increments of five. IOW, if your Fuel Adj. value for 3000 rpm is 5, change it to 10, then 15 until the popping stops. I wouldn't go more than +15.
As LRS suggested, it may be too rich rather than too lean. If going richer doesn't help, put the value back to original and begin the process going downward (-5 at a time). If you aren't comfortable doing these tweaks with the software, take it to your dealer and ask them to dial it out. Or, we can walk you through the process. Be sure to save your original map to your computer in case you want revert to it.