May be starting to float the valves in which case top speed, under its own power, will soon be zero. IMO, without some major engine work, your engine will not tolerate very many 140 mph blasts before it grenades. Keep us posted and be sure to visit the HD reliability poll soon!
Also, in the sincere interest of your safety, please note:
D408F BW 130/70B18 63H
D407 BW 180/65B16 81H
These are the factory original tires for your bike. If this is your current rubber, they are only rated for 130 mph. Get "V" or "Z" rated rubber if you don't already have them.
A blowout at 140 mph would almost certainly be fatal. Skip the tuner and buy a bike that was designed to perform at 140 mph plus if that is your thing.
Watch out for the tank slapper speed wobble too!