the front is from a xs750 special or 850 judging by the caliper mount, i don't think the 650's had that type of caliper mount. is the rear rim from a shaft driven bike or chain driven? the 750's and 850's were shaft, 650 was chain. i put a 78 xs 650 front forks and wheel on a 74 cb750, just needed a few spacers on the axle.