I went down this road not all that long ago. I completely disassembled mine. Down to just the frame sitting on my bike bench and the engine on my work bench. When I did that initially, last year, I ordered all the bearings I needed at once.I will check them out, thanks!
Definitely no Chinese bearings! I don't cheap out on hard parts, brakes or suspension haha. I usually aim to get the highest quality parts I can and just save money by fixing or repairing anything that's salvageable. Elbow grease is cheap! :wink2::grin2::wink2:
Using the stickied thread on the Supersport section of the forum, I found a reference that the bearings were the same as wheel bearings from an old Fiat. I ordered some for a 1957 Fiat 500 as the size corresponded to the steering head size. The problem is, there is a 1-1.5mm difference in inside diameter despite being listed as 1" ID.
Further research revealed that 1" ID could mean 25mm, 26mm or even 26.5mm. I ended up ordering a Corse Dynamics 26mm set from Motowheels and those fit perfectly. To make life a bit easier, pack them with grease like you would normally and put them on a hot plate. I heated mine to 300 degrees and dropped them on the steering stem.
Using a 1.5"ODX12" stainless steel tube, I tapped on them until they dropped all the way to the bottom, at which point I tapped them home using the same tube. All they needed was a few taps. No major effort required. Having things within reach once you drop the bearings on is also helpful.
Mine were so bad that turning the steering head without the weight of the bike on the forks sounded like a poorly built ratchet. Now, smooth as silk through the same arc from stop to stop. Also, I'd made a spanner type socket for a steering head nut on another bike and it fit the 900SS steering nut perfectly so WIN.
I'm still a long way from riding though. Still have lots of work to do....and possibly more bearings to re-order......sean