Are you using 93 Octane fuel?
Double check that nothing is loose on the front end.
May be time to consider the TFI. Little more fuel.
TQ
My 09 stock EG would make that noise (spark knock) when riding through the mountains in Montana. Try dropping down a gear till around 70 mph, and a tfi would probably help if this is
detonation. My Dobeck is in the mail.
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HEY, Good for You Guys, stealing My type of THUNDER..
These are the Right ON comments/answers i would of made..
PLUS Your 09 and My 09 ARE Too Lean out of the HDBox/off the floor.. ESpecially Heat requires Best OCTANE fuel of which 91 is about the best in Az. AND a little MORE Fuel IS needed than HD gives (EPA) requirements.
The GEAR (too high) and RPM (too low) when in it especially when Hot out.(Az.)...
Your LEAN condition no that is TOO LEAN is the Main problem..If using 91 octane.
I have Several friends in AZ. that use the TFI and Their bikes Don't act like yours BUT used to...
Not enough fuel like in a Stock HD = ping. also Lean causes HEAT and it is Hot enough in Az. to NEED more fuel to keep bike from that Ping-rattle.
The term from HD will be
They All Do It... YES they Do and IT is A fixable Problem.. MINE DOESN'T any more.
TFI is a piggy-back unit that Solves the too Lean condition showing up on OUR bikes..
You can get a lot of information by typing in TFI i the top of you ppage..
Also note TFI IS supported On Site in the "Product Support Area" on the main page, Dallas from Dobecks will answer ALL..
You can ALSO get "a" Discount Just by being a Member Here on HDT.com
Other Discounts are offered by Dobecks performance on their TFI or Gen3 , Either model does the need job.. Check with them to see IF you qualify.
Hope this SOLVES your problem...
signed....BUBBIE