Has anyone else come across a vibration / thumping  coming through seat area when backing off on throttle on a roadking, happens at most speeds

its not a metal on metal sound , more of a thump thump thump

 

Engine mounts ?

Never owned a Roadking myself , but plenty of Dynas over the years ( same same...)

First place I'd be looking mate

check the rear wheel/ bearings and tyres as well.

T1

Let the dealer take a look first Rob. Hopefully it will be something simple.

I would start by looking at the engine mounts too.

Engine mounts

Engine mounts? I put a post about it in tech. Its warranty if ur still in date. If not,an eazy fix,
Also check head bearings. Might be feeling it further back. And of course seat bolts and contents of panniers!

he's only had his bike for a month, i would take it straight back and get them to look.

One month? Take it back. Dont touch it. Dont take no for the answer.

Loose tank bolts? Mabey

Took me awhile to find that thump

They looked and felt tight but not tight enough to pinch up to the frame

A few more ft lbs did the job

Cheers

tighten all nuts & bolts today, found heaps not quiet enough. Went for ride this afternoon all is good, back to the way it was when I when I first picked it up from dealer

Thanks every one for advise . rear top box should be here tomorrow, can't wait. stereo will now have six speakers

Just check that the bolts have had Loctite applied, I have found all bolts on the HD's require loctite blue for all removable bolts. Especially mounting and engine fasteners.