Have you ever pulled the plugs on a stock bike ? 14.7 AF I have looked at many ,and they don't look too bad. Little bit of tan. YES , these bikes are running lean , BUT, the H-D people have spent countless hours on timing and air-fuel at ALL RPM's and throttle postions,etc. I have been doing this 'stuff' for many years and in the old days, a man would ride his bike into my shop and you could look at his ex. pipes and say WOW , we need to re-jet that carb. Pipes were almost white and then pull the plugs ,you talk about white and 'blistered' ! BUT , that back in the day where 96" was a huge motor. I run a TFI and all it does is 'ad' a little more fuel ,does not change timing,rev limit ,etc. but it runs great. Just a thought. Years ago ,we didn't have dyno's ,so I got real good a 'reading' plugs, fuel line,ign. line, etc. Dewey