81 KZ750 LTD random miss when warm and at idle.

Hey guys, just wanna say before hand that you guys have a ton of great information on here. Helped me a ton to get the bike where she is.
So my issue is kinda hit and miss.
It had the baffles knocked out by the PO.
It's been rejetted.
I recently synced my carbs, adjusted my idle mixture, and re-synced them again. I have adjusted the valves. And I had bought a APE cam chain tensioner because I misplaced a piece for the original. But it is tightened to a little over finger tight when fully warmed up.
So at first it starts up and runs great, pretty good, smooth idle. Not perfect.... but good.
It will rev through the rpms like a champ. No sputter and such.
But after a ride it will just randomly miss and I can hear the cam chain slap around a bit. Its killing me so I don't let it idle often. I have also lubed the timing advance and it moves freely.
What's left to check? The coils maybe?

Sorry if this is posted in the wrong thread. I'm honestly not sure where to post it.
Thanks ahead of time.

First thing that comes to mind is get some proper mufflers and restore the jetting to stock and then go from there.

I can see where you're coming from.
The bike sat for quite some time before the PO got his hands on it and when he knocked out the baffle he had a vintage custom bike shop nearby do the carbs and get it running.
So afaik it has been tunned properly.
It is a recently popped up problem. Meaning I could have caused it, but it wasn't immediately following any changes. And sadly as it stands, I honestly couldn't afford a new exhaust, even from Ebay.
Other than that does anything come to mind?

I'll see if I can get you guys a video of it.

It's not long but I hope someone might be able to give a pointer.
Even if it is just to return it to stock.

I've got a new set of plugs for it. So I will do a test today to see if the mixtures are right.
I should have done this before posting but I hadn't got them in the mail yet.

Is it worse on hotter days, or if you just came off a freeway? That's when the engine will be hottest internally. A bad miss at idle or even a stall after a highway run might indicate it needs a valve adjustment.

The noise sounds like the primary chain, not the cam chain.
Hard to say what the miss is caused by. It wouldn't hurt to replace the coil wires and caps. If forced to guess though I'd say the carbs.

I doubt those pods are doing it any good.
Steve

Yeah those cheap pods got to go there designed in a way that actually partially cover two of the air ports on the intake side of the carbs. That chain noise is the primary chain it usually means you need to synch the carbs. How did you synch the carbs? Like mentioned check the valve clearances.

Alright, sorry about taking so long to reply guys. I didn't mean to dip for that long.
So pretty big amateur mistake on my part.
(Don't laugh too much)
One of the idle mixture screws had broken off and lodged itself in there.
And tbh its honestly my first time working on 4 carbs. I synced them using 2 vacuum gauges(ordered a set of 4 but two were broke from the factory... go figure. I synced 1-2 3-4 then 2-3 and doubled check with 1-4. If that makes sense? I have also adjusted the valve clearance when I first got the bike, less than 1k miles ago. I see the exhaust side to be closer to the loose side. There was quite a few people saying a little loose is better than no clearance.
Other than that I also think I was slightly lean on the mixture screws because after resetting them it was still popping a bit on deceleration. So I've got most of that figured out. I appreciate the input and I'm honestly thinking of getting rid of these filters. They're so cheap and fall apart all the time. Haha. The po didn't even put nice ones on
But thank you guys for replying. I got kinda busy and neglected checking in.
I have got her running good now, but the only thing I notice now is possibly a little variation in idle when it idle for a long time. I should probably buy some rebuild kits and have my local vintage bike mechanic do a proper rebuild.