Rebuilt a 125M - Oil was not getting to the head (bad pump??) didnt know it and the motor froze up. At this point i have so much in it i dont want to just scrap it but non the less i don't want to spend another 250 bucks to re-fix this old motor.

Head, Cam, Piston, and cylinder are all destroyed.

Any options on bigger engine, lefian motor fit, can i fit a 86 engine in it??
Basically anything i can do, because i cant find a 1984-85 motor that runs

 

Maybe a 200sx