Thought it might be useful to send some pictures of the carb and the governor thing.

https://drive.google.com/folderview?...OYkgOxzDuhTx3O

The springs in the picture seem loose when the engine is switched off (can't see them with engine on as underneath the air filter). Almost like they don't do anything. Having said that the governor seems to work but not sure if these are related. Also, having now seen the springs, in the back of my mind I vaguely remember buying new springs in an attempt to fix a (probably similar) issue so maybe I fitted them incorrectly?