strange noise sounds like a dove when you let off throttle

[mdalbert]

My 98 standard with 48,000 miles is making a strange noise from the front of the engine somewhere.  It sounds a little like a dove when you flush them.  My first bad experience of any type with my Valk.  I found the lower radiator mount that is threaded and appears to need a nut but I found that it is normal, here in the tech section.  Any suggestions will be greatly appreciated.  

This is my first post here and I never mentioned it happens only when you let off the throttle.  It happens at pretty much all rpm's.

[GotValk]

My guess is crack vacuum lines, my be time to change them out.

Vent hoses  http://www.valkyrieriders.com/shoptalk/AirBox%20VentHose/venthose.htm

Here is some good information for you...http://www.valkyrieriders.com/shoptalk/

[Patrick]

As mentioned, it certainly could be defective vacuum lines/caps.. You mentioned the front of the engine, it could also be rubber build-up on the belt tensioners..