I bought a Summit brand kit of Holley carb jets for the secondaries on my Street Demon because I wanted to richen it up but something seems off. I went from the stock #86 to #88 jets and my AFR is about the same or possibly even leaner.
Did you check the plugs? When you make jetting changes you should always check the plugs to make sure they correspond to what your 02's are telling you.
