Will installing an after market automatic primary chain adjuster on my 2004 Fatboy void the factory or extended warrantee?

 

It shouldn't void anything more that a problem that you could have with the chain itself, if that happens.

Take a look at the topics at the top of this forum https://www.hdforums.com/forumid_242/tt.htm

Poke around down there while you're down there

 

The motor company has a new automatic adjuster that comes standard on the '06 Dyna models. I think it will work on '85 and later Evos and Twin Cams. Check the MoCo web site and search for part number 40063-05 or look in the 2006 big wish book on page 288. About $100.00.