u/Any_Historian3294

Hi everyone, so the engine blew on my cb 250 nighthawk MC24E, and now I am looking at swapping it out for a good one. I’ve found a few online that look promising.

But whilst I have the new engine out I’m going to change all the gaskets, and then I’ve heard you can turn the CB250 block into a 400cc by changing the barrels and pistons.

Does anyone know more info on this conversion? And exactly what parts are needed?

Any help would be much appreciated
Thanks