Hi guys, just finished the rebuild on a 1968 CB250, fitted many new parts and got it running. It runs nicely but there's a bad flat spot between 4500 and 5500 rpm. In the lower gears it will pull through it and up to the redline but once in 4th or top it doesn't have the power to get past it. It feels like carburation but I've cleaned the carbs more than once, and can't see anything faulty. I'd appreciate your thoughts!