RUNNING FAULT

HI THERE I WONDER IF ANY ONE CAN HELP I HAVE A 2003 WR250F WHICH MOST TIMES A LIFT OF THE THROTTLE IT STAYS OPEN SO INSTEAD OF ENGINE BREAK IT GOES FASTER HAD THE CARB OFF AND CLEANED IT BOTH THROTTLE CABLES ARE MOVING AND RETURNING FINE JUST WONDERED IF ANY ONE CAN HELP CHEERS.

Is there enough throttle cable free play?
Is the throttle tube or grip rubbing on the handlebar or throttle case?

By the way, the WR-250F (any year) ain't very much like a WR-250R.
The throttle cables and throttle tube work on the same principles, though. :)