I just bought this very nice cb400. The mechanic I bought it from said the stator was bad and I should not go over 4500 rpm's until I replace it. He also said that a good stator will make the motorcycle go faster. I took it to another mechanic who told me that the stator was fine and even if it was bad it wouldn't effect the speed of the motorcycle. The second mechanic rebuilt the carbs and tuned it up and the motor runs great. The top speed I am getting out of it is 62mph. This motorcycle is all stock parts. The 2nd mechanic told me that 60 65mph is as fast as this motorcycle will do with the stock exhaust, carb jets, and intake. I think I read that this motorcycle should do top speed of 90mph with stock parts. Can anyone tell me if that is true? If so can you tell me how to test the stator and what to tell my mechanic about this issue. Thanks.