I don't have the 240 kit but 2 of my head bolts pulled out, well they were actually done before I got the bike. A lot of people have recommended the cr500 studs. Tap the hole, counterbore and install the cr500 studs. I don't know about the 240, if they have enough meat on the wall left but, that's what works on the 200. That's what I am going to do. Also, I am no 2 stroke guy at all. I can do anything to a 4 stroke but I am learning the 2 stroke. so, I am just repeating what I heard, hope it helps.