Bike was running around 3000 rpms at idle this fall. Still rode it a lot. But wanted to get it in good running condition. Engine had a horribly degraded head gasket (you could see air coming out), so I took it apart and replaced all the top end gaskets. Adjusted the valve shims and had a shop change my valve seals while I had it apart. Also took some rust off the exhaust pipes and clear coated them. Put it back together and it wouldn't start. Got a good spark on the plugs and the cams all rotated smoothly, so i figured it was the carbs. Took the carbs off and cleaned them, they are getting oodles of gas now, and there is a new filter in the intake. Still wont start and I am flat out of ideas. Anyone have a thought?