My friend has a CB400SS that shows weird symptoms at 4th, 5th gear. I did not notice any gear shifting issue. At 3rd gear, it works normally and runs up to 80 kmph (cannot go any higher) But when shifting to 4th, 5th gear, it caps at 70 kmph.
I'm think of a gearbox issue. Can anyone suggest any other possible reasons, or steps to verify the issue?