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Anyone know an easy swap out for an lc4 engine to put into something more sm oriented. like a smc I guess, not a duke.
I am not sure I understand your question the way it is worded. But... Duke, LC 4, SMC (625) are all based of the same motor. Only cams and carbs differ. Newer models have the hi-flow head. Any of the LC 4 motors is perfectly fine for supermoto. It has won World Championships.
 
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