I have recently ordered standard needle roller bearings for my 404E, as well as some O rings for the seals. The order was described as follows:
2 x HK2030 Drawn Cup Type Needle Roller Bearing With Two Open Ends 20x26x30mm (HK2030-MB) = £11.30
1 x 2.5mm Section 20mm Bore NITRILE 70 Rubber O-Rings (2.5x20.NBR) = £3.99
Pack Size Pack of 5
1 x 3mm Section 20mm Bore NITRILE 70 Rubber O-Rings (3x20.NBR) = £4.01
Pack Size Pack of 5
The two different O ring sizes are to allow me to determine the best fit on assembly.
In my view the bearing arrangement for the SA pivot is not the best. I found the rollers on my bike, bought recently with an alleged 6000 miles on the clock, to be rusted and worn. The sealing of the O rings must be inadequate, and in any event the design of the needle roller bearing is more suited to a rotational, rather than a reciprocating, motion. The hardened steel bushes (and I need a couple of these) were fretted and/or brinelled, and at such a low mileage is astonishing to me. Lubrication really requires removal of the SA, not a great feature as this becomes a tiresome procedure as I have found on my Honda XR400 (which, being of the same design as that used by CCM, at least provided more bearing surface for the overworked needles).
I note the use of Oilite bushings as a replacement, but advice from the makers of these excellent products suggests this material is not really suited to the duty imposed. But were I using Oilite I would run the hardened steel bush in the Oilite, rather than the "bush in bush" mentioned by others, but I would still not expect a long or trouble-free life from the arrangement. Perhaps a good phosphor bronze bushing, with means of lubrication (grease nipples), might be better.
I am still new to the bike - indeed, it has not turned a wheel on the road under my ownership thus far - and I am still puzzling over an improvement to the SA pivot design.
By the way, it is possible to obtain plain hardened steel bushes from bearing suppliers to run inside the needle rollers mentioned above, but these are not of the "top hat" design, nor do they have the correct i.d. for the CCM, so would require a little modification to be used. Still, far cheaper than the spares counter CCM alternative.