I'm still pro isolation. The only good way, that I know of, is to not mount rubber using only the studs. The studs should be mounted solid into some kind of bracket of sorts and new bolts from a bracket to the frame with some isolation material in between. Part of the problem with stud failure is that most have just stuck some rubber in between the frame and the engine using the same studs. This gives the studs the ability to move and causes a lot of problems, but like I said, I don't know the two strokes. I do know that I had great success with the mount that I made for my 4 stroke.
This is what I made, if you feel impelled, maybe it could help you come up with something.