re: old bearings to put in new bearings.
The wheel bearings are somewhat recessed. What keeps the 'old' from sticking in with the 'new'?
Yeah..I've used old outside races (steering) and bearings at times, but not for the wheels due to the recessed part. So, not having tried that in this position I cannot speak from a knowledgeable vantage.
But, the recess isn't an issue?
Also, I put some neverseize on the hub/bearing before I put them in. Keeps them from the 'welding' that can go on that BRush mentioned.
Step 2 (step 1 having failed):
You beat the life out of the bearing and it comes apart, leaving only the outer race in the hub and you have no purchase to get it out.
Several have welded a bead on the race, when it cools it either comes out easily or at least gives you something to whack on.
If your wheel bearings are that bad, you'd best be getting your swingarm (pivot bolt) apart sooner than later. There's a piece that likes to stick!
CBR sells a bearing kit for the rear. Comes with seals. Lifetime guarantee! Of course, that doesn't mean they last a lifetime. But some (BRush) have had good luck: 1. With the bearings in the first place, and 2. Getting replacements from CBR when they do fail.
Compare something like allballs bearings with what comes from CBR and you'll notice a big difference. Allballs (korean or chinese stuff) don't last for diddle. Yep. CBR does cost more!
p.s.
They make a tapered roller kit for the steering bearings (oem is still ball bearings) in most street hondas, too! My 700sc thanks me! Now THERE'S an important piece of information!!