Yamaha mags take your stock disc up front(bigger bearing ID). How many bolts on the Enkei, I run a Kawi mag on a 750 4 bolt with a redrilled 750 disc, and sleeved down bearings.. I did not set up a speedo drive..
Pay attenion to bolt circle, disc dia. and offset, when looking to mount the front wheel.
You can do it in stages, take rear wheel off, mesure things up, reinstall stock.. then machine a few parts, have another re&re session. Is sprocket size close. or bolt pattern and offset if it had a belt ?