The carb is open 1mm and does not close when the brakes are applied. I'm leaning towards the LSN being too rich. Unfortunately it's raining and I won't be able to mess with it today.
Well ,if the engine revs up high after you let off the throttle ,it maybe too lean.
If the engine simply dies ,it could be too rich ,what is called a loaded up mixter ,which accures when
a engines sits at idle.Some people keep their engine rich like I do ,an keep the revs up to keep the engine running,
even when braking.
Some of my vids ,you will notice that I blip the throttle in entervals so the engine doesn't load up with fuel an die ,as
I do run my engines filthty rich.
Your engine may not be too far from a good tune!
I did notice that rod ,it appears that it was badly under stress!
My theory is too much fuel putting the engine in what you call a semi hydeaulic loc which puts the rod in dramatic
stress under pressure when the fuel detonates under combustion!
That's why I urge people to replace it after break ins!