hard to tell with an entire three seconds of video...
it's best to take 60 second movies and then upload them to youtube... and then copy and paste the urls here to auto-embed the videos so everyone can see them. .mov files need to be downloaded and viewed in quicktime for mac/safari users... youtube makes videos cross-platform and cross-browser compatible.
my guess is that the escape wheel needs bushings... but, again... hard to tell.
Yep. It’s out of beat. The extra tick is the leader hitting the crutch loop. Bend the loop tighter so the leader does not flop . Set the beat by slightly bending the crutch wire in toward the leader. That should give you two even ticks and keep it from stopping.
Will it run on its own (?) or is it stopping as in the video.
Check the entrance pallet for a huge dent worn into its face. Sounds like the leader, or pallet assembly, is actually striking something. Does the pallet saddle have plenty of end-play (?) It may be striking it's retainer wire.
Yes, it's grossly out of beat and you're giving it about 4x the normal pendulum swing ...