Just watched both videos, they raised more questions than they answered. 
I see two spark plugs that have what appears to be some bare copper wire between them. That is great, but where is the ground connection that simulates the engine that the plugs normally screw into? You have to have a complete path for an electrical circuit. You have current coming through the plug wire and jumping across the gap, ... to ... what?.
In your earlier video, the plugs appear to be screwed into some angle aluminum, and that angle appears to be resting on something that looks like a metal plate. My question all along has been "is the angle bolted or otherwise firmly attached to the metal plate to complete the electrical circuit?"
I am happy that it works for you, sorry to bother you so much, I'm outta here.
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I see two spark plugs that have what appears to be some bare copper wire between them. That is great, but where is the ground connection that simulates the engine that the plugs normally screw into? You have to have a complete path for an electrical circuit. You have current coming through the plug wire and jumping across the gap, ... to ... what?.
In your earlier video, the plugs appear to be screwed into some angle aluminum, and that angle appears to be resting on something that looks like a metal plate. My question all along has been "is the angle bolted or otherwise firmly attached to the metal plate to complete the electrical circuit?"
I am happy that it works for you, sorry to bother you so much, I'm outta here.
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The plugs only have to be electrically connected to each other via whatever they're screwed into. This is true both in this test setup and on the bike.
Have a look at the ignition diagram. Everything on the secondary side of the coil is a completely separate circuit from everything else on the bike. When the primary coil loses power, the magnetic field inside the coil collapses. This collapsing field induces a (high-voltage) current in the secondary coil. The current flows down from the secondary coil to one spark plug, jumps the gap, flows across the cylinder head (or in this case, the metal bar), jumps the gap of the other plug, then back up into the coil. The concept of "ground" is purely semantic in this case. I prefer to think of it as the cylinder head just being one big beefy (and convenient) wire bridging the two spark plug bodies together.
kokar: it looks like you're building your own igniter circuit? Nice job! Are you by any chance a ham as well?
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