loud, repetitive clunk on drive side of a B12

[Jocalopse]

I've heard a clunk while taking off, at first I though it was shock linkages, but then noticed it was repetitive. Thought maybe the drive sprocket nut had worked off, but not that. can't find anything out of the norm in the drive live. I'm dreading that it's internal. Only happens from a  stop  though, not deceleration or at constant speed, or roll on either for that matter. How loud it is depends on how much load the bike is under, flat ground, quiet clunk, uphill loud clunk, but it's only when starting out, it has a frequency that sound like it's drive related. can anyone help? Feels like it;s down by my right foot, almost like chain lash hitting the inside of the frame or something, but chain is fine

[fatblokeonbandit]

Sprocket carrier bearing or cush drive are easiest to check

[Jocalopse]

I'll check them but it sounds inboard

 

[Jaydee]

Do you oil your chain regularly? Could be a dry or tight spot on the chain. ???

[Jocalopse]

real wheel bearings.....working on them right now, heat gun died, time for the propane torch