The noise may be coming from a bouncing pop-top roof. The air pressure
build up while driving can lift the roof. When air escapes the roof
vibrates. Tie down the roof and see if the noise stops.

Larry
________________________________________
Seastoner wrote:
> 
> Hi,
> my 85 Westy has a nasty habit of creating a very loud vibration right
> above my head when I take her up over seventy. I thought it might be
> the bungy cords I have up there but when I took them off it was much
> worse...sometimes it creates just a slight vibrational noise, other
> times like a jackhammer...what's going on? Thanks for any advice,
> Rick
> '85 Westy
> Truckin' Like The DooDah Man....