To start, the bikes both ran fine. We powerwashed both bikes, cleaned air filters, pulled carbs off, soaked and cleaned with carb cleaner. Put both bikes back together, now the 92 is only running off the left side and the 03 is only running off the right side. If you put a peice of paper to the exhaust, the side that is not running is sucking air in. Between the two bikes we have swapped every cinerio of carbs back and forth. We've taken compression tests...both test good. Changed the spark plugs multiple times. Pulled carbs, tore apart and checked multiple times. Switched spark plug wires. Switched reeds from one bike to the other...did not make any difference. On the carb from the side that is not firing, we turned the fuel air mixture screw all the way in, didn't make the bike run any different. Pulled the reeds on both machines....they looked fine. Put a new set of intake boots between the carb and reeds...that didn't help. Wondering if powerwashing it got something wet....its funny both bikes ran fine until we cleaned them up....now they both are experiencing the same problem. Could it be something simple that we are overlooking?