I have a similar noise on my Heritage during in town riding....if the gear is just a little too high I get the pinging noise....my dealer told me it's normal as well........I am also planning on a new dyno in the coming months.

 

Ok, is everyone ready for this?

I ended up at my indie for half an hour and he took off the primary inspection cover and checked the chain even though I said it really didn't sound like an engine noise and after listening it started sounding like it was coming from the gas tank/ console. I removed the seat and the console and checked everything and it was tight. The indie said it could be the wires under the tank and to check it out. So after that I was off. I had to stop by the butcher before I went home and started putting my clutch hand over things to try and rule out the location. I was leaning farther and farther forwards and could still hear it coming from the front.

So here I am leaning over the triple trees with the bike revving at a constant 3K and I reach forward and grab the headlight and it stops.

It was my daymaker and I bought the rubber vibration damper from HD but never installed it. It's on now and not making any noise. /face palm

 

Thats hilarious.......Got to love harleys