What have you done or has been done already? Is the bike stock? Aftermarket exhaust?
As Fulltilt says before any advice can be given we need to know what mods have been done to the engine/bike. Most likely it is something simple.When I drive on the 5th Gear, when I close the throttle ( i use the brake effect of engine) there is a load shot.
This only happens on the 5th gear.
What should I do??