11.5hp Briggs only Idles or Runs Flat Out.

Hi, I have got a problem with my 11.5hp Briggs engine.

Model: 259707
Type: 4028 01
Code: 92032710

Basically I have recently rebuilt this engine and the carb and it will only run at idle or flat out. I have made a video to explain things a bit better and to show you.
I may have put something on wrong or it could be something simple...





Thanks!