I have a Klt 200 That I chopped apart 2 years ago. I made swing arm mounts and a swing arm that is about 7inches back. It has about 11 1/2 inches of travel. I put ATC250R Forks and trees on the front. It was kind of useless with the stock moter so i was wonder what would be a good replacement moter. I was wondering if a used 400ex moter would be good. I want some thing snappy and i dont have a huge buget. I plan on running it on a track with tight turns and big jumps. It would help if the moter is light becase the chassis is kind of heavy.