Need to replace my KX125 2002 engine and wondering if a 2001 KX125 engine (complete engine minus carb/CDI) will fit into the frame without any modifications? Do they have the same mounting bolt pattern? What other engine parts are/aren't compatible, carb/CDI box/stator/radiator hoses etc.? What can I keep from my old engine and what will I need to replace?

Thnks
amck