knock

As the title says. Please check out the attached video. I know it's not good, wondering if anyone can pinpoint this scary knocking? I'm wondering if the timing is off and the valves are kissing the piston a little bit? Probably too easy, the sound is pretty catastrophic. I am scared to...

I replaced the motor in my 2004 fz6n. thought some may benefit from what I learned. Thanks to Scott for his help. The original motor had a bad knock when I bought it, got it very cheap. Turned out the camshaft had a slight wobble and the gear driving the clutch got very tight every 360 degrees...