I am agreeing that the motor sounded really late but it is hard to tell in the video.(This turned out long.)
You seem to have an impulse coupling so let's use it. I am just guessing here but I suspect you are not finding top dead center (TDC). If you don't have a timing pointer (and even if you do) you need a piston stop. A good one is a gutted spark plug threaded for a bolt or a piece of all thread. On fairly horizontal plugs this might not work as good.
In any case you put the stop in so that when you carefully roll the motor over, it contacts the stop reasonably high in the cylinder. Mark the front pulley or flywheel (flywheel tougher) at the pointer. Now carefully roll the motor over in the opposite direction until it stops again. Mark it again at the pointer.
TDC is EXACTLY halfway between the two marks. This is why you want he piston to contact fairly high so the marks are not way far apart.
Now when you roll the motor in the direction of rotation the impulse should snap just as your TDC mark passes the pointer.
I just pulled a mag like that on an M and it is driven by two drive dogs in the back of a gear. I think your mag is driven the same. If your motor is as late as it sounds you cannot twist the mag far enough to bring it into time. That would mean you need to move the gear. On this M the drive dogs are roughly horizontal. But I suppose yours could be different.
I assume you have everything else right. If you have fairly proper fuel, compression and spark at the right time it should fire in the first few revolutions.
I have seen a vertex mag that seemed to have good spark when you turned it but motor would NOT run right until the mag went to a shop which I assume included recharging the magnets. I don't know much about that. I am just saying the mag could be weak (after all these years).
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