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    1981 CB750C Rear Sprocket Change?

    I have an 81 CB750 custom. I am thinking of changing the rear sprocket to lower the engine rpms on the highway. (it runs about 5500 at 60 mph). It currently has an 18 tooth front sprocket and 43 tooth rear. Would going to a 39 tooth rear sprocket kill the low end torque? Any advise would be...
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