I just had Stage 1 2:1 pipes installed and on my first tankful, have fallen to about 38 mpg from 42. (with 1200 total miles on bike) Is this about right, considering enrichment? The pipe interior is very blackened with soot at only 150 miles.
Could it be a problem between the seat and throttle.
2011 Cross Country 2007 Harley Street Bob V&H Big Radius pipes Stage one breather
1972 FLH (been through 3 wives and still loves me)
1976 Jeep CJ5 my orange turd
2004 V92TC GONE