2009 Yamaha Venture with 9900 miles. Recently removed the tamper proof caps and adjusted pilot screws. Had a miss at idle and a stumble at low speed and popping back through the exhaust on decal at low rpms. Had to adjust cylinder #3 out a total of 4 turns after seating the screw. Other 3 pilot screws are about 2 1/2 turns out. Plugged the AIS system, Changed air filters, did the carb sync, changed plugs, checked both carb diaphragms on right side, changed a vacuum line and both vacuum port caps. Cant find any vacuum leaks. Even switched coils in the rear. The engine is a lot smoother at idle now and I don't get much of a stumble or miss but still have the popping back at low rpms on decal. I thought that this bike may have sat for a while before I bought it so i ran 3 or 4 tank fulls of seafoam through it. It seemed to get worse after I ran the seafoam. I removed the fuel filter and it was like a reddish brown color inside. Is this an indication of maybe varnish buildup from the bike sitting or will ethanol discolor it? Is having to turn the pilot screw out 4 turns an indication that I have a stopped up low speed jet on the carb on #3 cyl? Will it hurt to leave the pilot screw out 4 turns? A lot of questions I know but hopefully someone can enlighten me. Thanks!