X2 ^^^^ Just run it until the fan turns on. No need to idle for an hour
If theres that much sludge, consider removing the primary cover to clean it. It's easy.
Thanks John. Happy New Year.
'Idling to get up to temp' is fine (of course) and absolutely preferred especially in cold climates. Long stroke, heavy crank swinging V-twins do NOT like to be fired up cold and revved or loaded. Lots of shear strength trying to break down cold oil is not good. Be sure to use a viscosity that matches your ambient temp range. Not just 20w-50. In Florida straight 60w was recommended and performed flawlessly, for a snowy area, a lighter oil would be good. Check your manual and do what it says.
"idling for 45-60 minutes" extreme, and pointless. It only takes 5 or so to get hot enough to turn on the fan.
A idling motorcycle engine is barely producing enough oil flow or pressure, especially if it's worn. There is no airflow to keep temps in check, and the fan is only so good. It isn't cooling a radiator, it's just blowing air around....
Obviously it's also a danger to have it running in the garage that long regardless if you open the door on a blisteringly cold day.
To your original question... If you are that worried about the sludge in the primary, just take it off and clean it (I would just use a rag and avoid copious amounts of brake cleaner). You can find a manual .pdf download at Buellmods.com or Buelltooth.com. It's easy.