OK, so I picked up an '05 rmz-250 the other day. The bike is in OK shape but the engine seems like its going to need crank bearings. I got it for a steal so i'm not worried about that aspect. I actually really enjoy how this bike handles and besides an awful engine, it seems be pretty decent. The suspension is plush but not washy, and it seems to lay over nicely in the turns. I actually enjoyed how the bike handles in the woods, though the 250 thumper isn't what I want. SO, i'm left with a dilemma. Something inside me wants to throw an RM250 engine in it and be done. But that would require chopping the frame and adding a custom Y-piece, but i'm not entirely opposed to that thought. Another idea is an older air-cooled two stroke with a side-port exhaust (80's kdx200s in particular) so I won't have to chop the frame. Lastly, I've pondered the idea of an XR250 or XR400 air cooled thumper in it. This is really a screw around project for me and I'm just wanting something different. Although I'll build it right, I'm not really worried about being politically correct (i.e. honda engine in suzuki frame) So I'm open to any wild ideas you guys might have. In the long run, I want something for the trails that handles decent and I wont have to worry about breaking down.