12-31-2020, 08:29 AM
So I have the left outer cylinder, if sitting on the bike, running rich. I just installed a full Delkevic exhaust, stock air filter, PCV with the yoshi map. At first I ran the stock map and didn't have the O2 sensor installed and went for a quick ride. Obviously the check engine light was on, but the bike ran better than stock. After returning, I noticed 3 of the 4 headers had changed to the bronze color, but the one was still silver and new looking. I pulled the plug and it was dark brown and shiny, the others a nice light tan. I next put the O2 sensor in and went for a ride. On the highway, the lower end felt fat or blah, but the top end was much better and was able to pull 90mph with relative ease. The stock bike could hardly hit 80mph. I live at 5300'. After returning, the one pipe was still silver showing it was still running rich. I then loaded the yoshi map and it made the lower end much better and very responsive, but the upper end was back to blah. The 2 maps are very different and the yoshi one takes fuel away which is the opposite of what I'd expect? Dynojet is of little help other than trying to sell an auto tune. Anyways, sorry for the winded story, but does anyone know why one cylinder would be running rich? Could the power commander cause this or is the fuel injector need replaced? Could running without the O2 sensor have caused a single cylinder to run rich as a default kinda thing? Thanks for any and all help!