engine types

[polish pete]

hey i was wondering how what are the differences between a cr250 2 stroke compared to a 250r motor from late 80's. im going to do a hybrid project and im still figuring out what parts i would need and could still use.

[number5]

I dont know about the 80s but I seen on a site that had cr250 cylinders with powervalve blank plates on. I think they sold for 750. I guess the bonus was they plated sleeves.