I'm sure you've already checked this but before you spend a lot of money make sure your spark plugs are not the culprit.
Last year on a completely stock bike I was Vtuning with TTS and was getting spark pulled at 8 degrees on both cylinders. IT was almost constant. It turned out to be the new NGK spark plugs I had used. When I put the stockers back in the spark retard disappeared.
This year with a cam change, data run was showing max spark retard. I removed the plugs and regapped them to exactly 0.40 and spark retard disappeared.
If I were you I would make sure spark gap is correct and if it is, and you are not using stock HD plugs, give them a shot first. Only cost you either $0 or $6.
Originally Posted by Jcav
Ever since I had new valve guides installed in my heads that Big Boyz ported for me something been off with them. I tuned it with the mastertune then I preformed several
Data runs. In each run the spark is being retarded up to 8* in both cylinders and yes I have retarded the timing in the spark tables with no improvement. Also there is no pinging audible and I know what pinging sounds like. So Iím wonít be dumping more money in these heads.