A couple of months ago l bought 2 rather tired klx's for my twin shock kdx200 project. They're remarkably heavy to move around the shed until the motor comes out !
There's plenty of space in the frame for the little 200 motor. The rear engine mount using the swingarm bolt works for the 200 engine in the klx frame. The bolt diameter is correct but there's a small mount width difference of 6mm I'll need to sort.
There's a minor issue of clearance for the kickstart knuckle and there might be an issue with the airbox/carb alignment but plenty of room in the frame to work with. It looks like the sprocket alignment is pretty close too.
Time to make some engine mounts.