Doce
.020 Over
You said you put in a new K&N filter, was that at the same time as the muffler? Did you apply the oil to the filter or possibly too much oil?
If I were you I'd also try removing the new slip on and letting the bike run with just the headers. If there's no black smoke then I'd say Dave is right and it's the oil in the pipes.
If I were you I'd also try removing the new slip on and letting the bike run with just the headers. If there's no black smoke then I'd say Dave is right and it's the oil in the pipes.