If its running that rich You might need to change the plugs. they maybe getting all gummed up.Agree with Jeff, you are probably running too rich which can account for poor mileage and black exhaust tips. The programing on your ECM sounds incorrect. May have to go to HD for a reprogram.
I replaced the plugs already as well. I've checked all that I could so I've reverted to take it to a local Harley mechanic that is trusted by many in my area. I'll post what he finds and what the fix is.If its running that rich You might need to change the plugs. they maybe getting all gummed up.
F.K.
Wasn't really sure what I was hearing but I'm running ethanol free gas. The bike has 58000 on it now and the cams have been upgraded to Andrews 26, I believe, also upgraded hydraulic lifters and chain tensioner and 2 into 1 exhaust, all done at 30000.You said your valves are pinging / rattling. Are you running premium gas? If I run regular mine will. Mid grade or premium and she purrs like a kitten.
Definitely check your fuel pressure. The test gauge will plug right in where your fuel line comes out of your tank. Quick connect.
Like Jeff said you should be getting upwards of 40+ MPG.
On a whole different note, how many miles does the odometer show? Do you know if the cam chain tensioners have been changed / upgraded yet? They should be changed out at roughly 30,000 miles. Hydraulic upgrade will last much longer.