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I changed my rear wheel bearings but I forgot to put in part # 92143, "collar,rear brake drum" back in and didn't notice until the bike was all put back together. I couldn't get one of the bearings out so I had to take it to the shop and forgot to bring this piece with me. This part seemed to just sit around the axle and between the bearings loosely and I couldn't figure out it's exact purpose. Is this an integral part of the rear wheel assembly that needs to be reinstalled or can I wait until I change the bearings again? This probably sounds like a stupid question but humor me...
 

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I changed my rear wheel bearings but ... # 92143, "collar,rear brake drum"
Yes, this piece is required. You should not operate the bike without this spacer.

The bearings are designed strictly for radial stress loads - not for side loading.
This spacer allows compression loads (you properly tightened the axle nuts) to be applied only to the inside race of the bearing.

If you ride the bike without this spacer, you will destroy your new bearings because they aint designed for side loads.

 

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burnormal, If you attempt to tighten the axle nut to anywheres near proper torque of 50-70 foot pounds, the wheel probably won't hardly even turn without that spacer between them.

The rear wheel axle has to be tight enough to not slip fore & aft in the chain adjustment slots when on the brakes and then the throttle. Not very possible without that spacer.
 
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