Going back to post number one.
Bike ran fine untill you cleaned out the tank and replaced petcocks and inline filters.
Unless you broke out tools and started tweaking things I'd go to the left carb and make sure it's getting fuel and all passageways are clear. Sometimes, sometimes .....you can start her up and cover the air inlet with your hand, give her a couple of revs and pop your hand off while revving. Seeing if that will clear her out. Might get lucky, costs nothing unless it flame backfires in yer face.