When my motor went out in my 175, i took a blaster bottom end and see how well it would have fit. It was damn near identical. Just have to move a couple of mounts and it would be good to go.
Now, with the blaster motor... You could chop the back end of the frame fit the blaster swing arm/axle in there. The swing arm bolts to the back mount of the blaster. This would be a more in depth build, but it could GO if you modded that blaster some what. With the swing arm and axel being lined up to the engine.. you wouldn't have to worry about the kick start(wheels are far enough back), the chain would be lined up. You could fit hydraulic rear brakes. and a 400ex shock in the back.
This is giving me ideas for my 125.. lol
I just wanna go fast. If your not first, your last!!
Reproducing the Tecate CDI. Contact me if you need one. I'm most accessible on FaceBook. You can find me on the 1984-1987 Kawasaki Tecate KXT250 Group.