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Have a 74 xs frame with a 71 xs 650 motor, want to do a big bore 750 kit but every kit says 74-84. Has anyone done this on a 71 motor? How different r the 71s from new yrs. Is it a waste of time doing this on a 71?
Makes the big bore kit that you are looking for. This subject has been reviewed many times in the forum. Try the search function and I'm sure you will find a ton of threads regarding 256 big bore kits.
And no, you are not wasting your time. The 71 motor actually has loner connecting rods and a more agressive cam than the later 447 motors.