I have heard that you can do the opposite of this, fitting a MR175 top end onto a CR125 bottom end to have a 6 speed MR175, but I was wondering if the reverse was possible? If it is possible, would it be a simple thing of bolting them together or is it more trouble than it's worth? MR175 pistons and rings are getting nearly impossible to find, and if you can find them, they are very expensive

. I currently have an extra MR175 bottom end minus a crank and i would like to build this combination if it is feasable.
Thanks in advance.