which engines fit?

[ohiok5]

i have a 87 250x that needs a bit of engine rebuild work, so i was wondering what other engines will bolt into this frame. will other honda engines work. such as a xr200,250 or even some of the chinese engines. the rest of my 250x is in poor shape and not worth putting 5 or 6 hundred into the motor is why i ask.

[2muchquad]

300ex or 350x motor are the easiest.Anything will fit if you dont mind doing extensive modding to the frame

[ohiok5]

actually i just found a nice cheap 300ex to get and use my 250x for spare parts.