Topic: tight spot in chain and in brake..Indications of???

[my name is nobody]

Can uneven chain tension and what seems /feels to be a flat spot in the rear drum be related?
No matter what chain or sprocket(s) I try, or brake adjustment I do, I can't get a consistent adjustment to obtain satisfactory/consistent results. for either condition. The wheel looks true, and spokes are tight. Could a somehow bent or damaged hub be the cause?  I also tried different used cush drive rubbers to no avail. the rim was replaced along with new spokes and trued., and current chain is new. I'm stumped The tight spot in the rear brake becomes noticeable once the rear brake is correctly adjusted. Rear bearings have been replaced in the past, and
seem to be ok. Anyone experience these types of behaviour occuring simultaneously and know of the fix?
Thx.....

[Don R]

 All I can think of would be to put a dial indicator on the hub on either or both sides, turn the wheel and watch for runout.

[754]

Are you jamming the brake on, then tightening axle... that will centre your brake better.

[bryanj]

WHAT BIKE

[my name is nobody]

WHAT BIKE

750 k5....sorrry, didn't think it would matter on that one

[my name is nobody]

Are you jamming the brake on, then tightening axle... that will centre your brake better.

Yes, as best as I can. Sometimes the axle wants to "roll" forward crookedly inside the swing arm while I am
tightening the nut. It is necessary to insert an appropriately sized screwdriver thru opposite end of axle to prevent axle from turning while torquing the nut.



i 

[Don R]

 Yes, you should use a holdback on the opposite end. I'm lucky enough to have parted out some barn/field bikes and have a few totes full of spare parts to try for these kinds of problems.
  I always look to see how far away someone is, it would be so cool to just run over and lend a hand or take a different part to test. Only once has a member been close enough.

[bryanj]

It matters what bike as the 500 is known for rust getting behind the brake drum and making it oval, never heard of it on any 750 though.
Many answers depend on model and year

[Redline it]

Coincidently i was reading the underseat manual today, 70's cb400f. And according to whoever translated the japanese lango in english made some pretty good points, of which i have never seen before, and surprisingly the condition You describe has normally been present off and on for the past 40 yrs, anyway it said kinks, maybe stretched, dirty or dry links (battery corrosion?) which none of those i have, i hope.

[my name is nobody]

I haven't had any time with the bike lately. I got as far as removing the rear hub. The plan is to swap it with a
different hub. I dread re lacing the rear wheel.  Will post any improvement if hub replacement helps/changes
behaviour. I've run out of possibilities as what could cause the issue.