I have a really annoying issue with my Mountfield sp421 pdr roller mower.
It starts and runs fine but when it tries to hunt using the automatic choke that’s spring operated it stalls. It’s almost as if the hunting spring mechanism hits resistance and doesn’t settle or correct itself. It just moves to adjust the chicken then stops in one position stalling the engine. It moves freely with my finger?
I have changed the carb to a brand new one and still the same issue?
So it’s something to do with the automatic hunting / choke mechanism.
