I have a 03 classic 600 I'm working on for the neighbor. She said it ran like crap and wouldn't go over 40. Took it for a ride and it acted like it was running on half choke. Started digging into it and found the vent line from the mag side carb was off. Put the line back on and it will run like a raped ape now on top end but bottom through midrange it's over fueling. Changed the plugs and tried a different coil and completely cleaned the carbs. Both cylinders are at 115 but the mag side piston is soaked. Reeds are good and valves are clean. I'm at a loss here