Briggs and straton engine wont rev.

I can see where the choke and throttle assembly should be but the lever has been factory bent (no paint underneath it) to hold it in place.

The butterfly in the carb is connected to a lever that runs off into the top of the engine somewhere, so what actuates this lever to open the butterfly?

 

Right then guys , the engine seems to be hunting, i cleaned out the air vane governor although it seemed to be working fine , cleaned any old grass out from around the linkages but it still hunts , any ideas? diaphragm?

 

The engine, or at least the bit in the close up photo, looks like the same one that's in my dad's rotovator. That has a tendency to behave in the way you describe. That little lever that flaps about, shouldn't. In the case of my dad's one, it turned out that the little spring you see in the pic had stretched over the years, and in effect was no longer serving its purpose. I did a bit of botching to secure it and it was, for the most part, fine after that.

In the case of my dad's rotorvator, there was also another problem. The carburettor had come a bit loose where it meets the inlet side of the engine block. It had also blown a gasket there. The consequence was that the fuel/air mix was wrong, so even when it was running better, it still wasn't right, so I made a cereal box gasket. I removed the carb, wiped a bit of light oil on the area that the gasket should be, and stamped it onto a bust up cereal box. This gave me an oil print in the exact shape that the gasket needed to be, which I then cut out carefully with a stanley knife. I stuck it all back together and it ran much better.

 

I had a look at the intake to engine seal , I gave it a bit of a tighten because I read they can come loose there. It didn't help. I am going to have to strip it down and see whats what.
Thanks for the tip on making gaskets.

Edit - I held the lever on top of the carb perfectly still with a screwdriver today and it still hunted so I can rule out the springs not doing their job.