I have a 2002 fxdwg3 that the guy I bought it from did not run since 2010 and left it sit with gas in it. Bike has 3400 mileson it and when I drove it home was spitting at half throttle through all the gears and would backfire some slowing down and down shifting. I got it home and pulled the carb off and cleaned it real good, it did not have any significant crudin it, jets in it are 200 and 40. I know someone was in the carb before cause all the screws on diaphragm cap were stripped out but bowl screws were ok. Bike has stock air cleaner and pipes. Does anybody have recommendations on what to do next? Jet sizes etc.