John was seen playing a Gibson Les Paul Goldtop in March 1991 during a side project with Flea (see image below). The project revolved around a band called HATE (Hops, Anarchy, Truth for Everyone), which included John, Flea, Angelo Moore from Fishbone, and Nick Alexander (formerly of Germs). The band disbanded later that year, likely because John and Flea shifted their focus to working on Blood Sugar Sex Magik.
Although it’s difficult to determine much from the photo above, the guitar was most likely not a vintage model but one from the late ’80s or early ’90s.
John used this guitar to Record Search and Destroy, and he also used it on overdubs on the Blood Sugar Sex Magik album. You can see him recording Search and Destroy with it at 22:19 in this clip!
https://youtu.be/CtodRwaY700?si=ybMwkrpYqzTlYtN8