Does anyone know, is it possible to install a 660 LC4 engine to a 640 LC4 Adventure chassis? If possible, does 640 LC4 engineĀ“s carburetor work with an 660 LC4 engine? Are there any other things that I have to consider? I have a KTM Adventure R 640 LC4 (2000) motorcycle and my engine is dead. I wanted to change it completely and I want know if it is possible to install a 660 LC4 engine to a 640 LC4 Adventure chassis... Please somebody help me.!!!