If not, it appears to be a slightly loose rear chain drive grazing against the chain guard at slower speeds or under load (when somebody's on the rear seat) & will go away once the cain is stretched under higher speeds. If so, check ur chain tension. A slightly bent chain cover might also be the culprit & not the chain.
There aren't any more sound making parts at the rear apart from the silencer. Guess you are not misreading the little 'put-put' of backpressure after starting a cold engine when carb mix is towards leaner from the ideal.
Take care. Happy Thumping.
Caravans.



'Almost' every TBTS owner would like to replace silencer to something like bullet's stock one or Goldie or Indori or Punjabi. But here your mechanic replaced a bullet's silencer to thunderbird !! No offence to your mechanic's knowledge or taste but you can guess, what I want to say...
)



. That too after irritating them to the core.. Just one advice for you buddy ! Keep pestering them , then only they'll atleast try to make the delivery !

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