We got version 2.0 back together. I moved the motor back and up as far as I could without going into the swingarm. It still sits about 3/4" forward of where the stock motor drive sprocket does, but I think it will work. I also raised it a little more than stock since the stock configuration eats up the plastic Guide on the swinger pivot so bad. I had an fmf pipe made to fit the new position also. It turned out great, but it didnt leave me room to mount the bigger yfz 450 radiator on the frame, so I had to mount it up front. Its ugly up there, but I really dont have any other options without using a smaller radiator. We put about a gallon of gas through it in the yard last night and so far so good. Def gonna need some seat time for my son to get used to the 2 stroke.
Here is him riding it last night for about 30 seconds.

http://m.youtube.com/watch?v=ri5X9Gn7ppo