Jon It wasn't dificult, just a PITA. Someone mentioned the centerstand interference problem. I did not have the special tool. Just an arbor press - useful for getting the bearings out and the new ones in straight & a selection of sockets of various sizes. Two of the bearings in the relay arm cannot be pushed through as there is a step machined in the bore they seat against. With a little ingenuity you can drift each one out from the opposite side. Be careful of the bore but don't worry about the bearing. When installing the new ones BE careful as some of the bearings only have a seal on one end that needs to face out.
I didn't try to match them up but I did write down the numbers, so any bearing place should be able to match them. For the 1993: RELAY ARM Quantity Yamaha Pt. # Mfg Mfg Part # description 2 93317-41761 KOYO BHKM1730JU NEEDLE BEARING 1 93317-42060 KOYO BKM2035JUU NEEDLE BEARING 1 93399-99919 - - spherical BEARING 2 93101-16131 KCR MHS 16.5 26 5.5J SEALS Swing Arm 2 93317-41761 KOYO BHKM1730JU NEEDLE BEARING 2 93317-52865 NTN 7E-HMK 2830 NEEDLE BEARING Hope this helps Bill
