what do you think is up with my chain?

[Toner]

My chain did not seem to making the smoothest of noises while driving. So I recorded a stationary video of it rotating in 1st gear.
Seems to be jumping quite a bit. You can see it bouncing best at about 15 seconds in in the vid below
Anyone have a diagnosis? 

I cleaned, lubed and tightened the chain and tried to align it recently. Also cleaned inside the front-srocket cover.

The slack is to spec and I tried my best to get it aligned straight but maybe it's still off. 
Before I try to align it again, does anyone have any other suggestions why it might be like this? Maybe a loose front sprocket or something else?

Cheers!

[Slack]

do all the links in your chain move freely or are some of them frozen?

[Watcher]

I had an old mountain bike that used to do that, but it would also skip gears and such as a result.  It's a frozen link in the chain.  Get a new chain.

[Toner]

Just checked and links all seem good enough. It's a new enough chain. I got it in Feb and I've looked after it. Only started doing that after a clean-up + tighten where I cleaned out the front sprocket cover too. 

It doesn't jump around if I just spin the wheel with my hand.

Could it be something with the front sprocket when the bike is in gear? 

When I had the cover off earlier I noticed the front sprocket isn't rigid, there is a bit off play in it where you can push/bend it or out just a little but I figure this was normal.

Was going to take the sprocket off to clean behind it but I didn't have the tool to get that circ clip off.

[Toner]

I should add, I changed the clutch cable too recently but I think I got it on pretty well and there isn't a problem with it.
I was wondering whether that clutch pin which goes into the arm on the sprocket cover had to go into its hole a certain way because I took it out but didn't notice a particular way to put it back in.

[Slack]

If it all seems new and spins well by hand then I'm guessing your idle is jumping just a bit, causing a surge and lull, which makes the chain jump around a bit.

[Toner]

Thanks for the help. How would I tackle fixing that?

[Toner]

Hey guys, still trying to fix this problem.

Can anyone tell me would the rear bearings cause the chain to jump like this? 

I also can hear a knocking noise when I pull the clutch in or walk the bike.
Here are a couple more videos of me rotating the chain manually where no problem is apparent and then another of the bike in 1st: 

[youtube]https://www.youtube.com/watch?v=u3iWvLc1ElQ[/youtube

Is there a good test to tell if the rear bearings are shot? 

And might the problem be with the front sprocket? 

[Slack]

Your spinning the tire backwards by hand.
Spin it the correct way and see if the chain jumps.
Clicking while walking the bike is normally a sign of the chain being too tight, sprockets being worn (especially if it only clicks while pushing it backwards), or the chain being worn.
A knocking when you pull the clutch in with the engine running? in N and 1st? not from the valve train?

[Suzuki Stevo]

Clicking while walking the bike is normally a sign of the chain being too tight

It looks kinda tight to me 

[Toner]

thanks guys, I'll loosen the chain up a bit and rotate it the other way. Might have to do it tomorrow as it's midnight here.

So nobody thinks the rear bearings might an issue?

[Suzuki Stevo]

So nobody thinks the rear bearings might an issue?

Grab the rear wheel at 9:00 and 3:00 (am/pm doesn't matter) and wrench on it to see if it's loose in any way.