Sometimes on the governor linkage you can move springs into a better position to stop the motor revving too high but other times I just adjust the governor arm ,undo the bolt once you have scribed a line so you can see how much you have adjusted the position from the original position then tighten the bolt after you moved the arm.
If you go the wrong way the revs go up.
If there is no mixture adjustment on the carby then I would adjust the governor arm.
