Yep, it’s glued on. It’s a “rubber cement” type of glue and the bond can be broken by inserting something long, skinny and flat  (like a metal letter opener or screwdriver, etc…) between the rubber grip and the handlebar. Work your way around and maybe give it a shot of lubricant. I heard that rubbing alcohol works too. Me, I just used a knife cut a slit down the grip and threw it away. Never regretted it since my new ISO-grips are so much better. Hope this helps.  

Why not take the time to get new Kuryakyn grips?  You will be glad that you did.