When i bought my 250R it had a head on it that has Pro Cross on the top of it, and anyone i asked said they never heard of it, i was asking to see if anyone else might know, it has a top motor mount that my 250R don't have and the plug goes in on an angle, I'm thinking it was originally for a CR250R dirtbike

 

I've never heard of it either, but I did a little google-fu and found out, its "Pro X" (I think thats what your talking about). They have a bunch of Pro X stuff on Dennis Kirk. Looks like they make a lot of engine parts for 2-strokes also, including 250Rs. Hope this helps.

 

Very popular, many of the big bore cylinder kits are Pro-X.....