SOHC.co.uk Forums > CB500/550
Primary shaft bearing
AshimotoK0:
I fitted a Koyo one last week and it went on the primary shaft OK . You need a high speed version C3.
Bought mine years ago but this looks the same
https://www.ebay.co.uk/p/1130582653?iid=123504184610&chn=ps&norover=1&mkevt=1&mkrid=710-134428-41853-0&mkcid=2&itemid=123504184610&targetid=879157198036&device=c&mktype=pla&googleloc=9050383&poi=&campaignid=9437867024&mkgroupid=104303480548&rlsatarget=aud-629407025025:pla-879157198036&abcId=1140486&merchantid=109947210&gclid=Cj0KCQjws_r0BRCwARIsAMxfDRgUnZHrii8cFZ9GvVzXERgPe0BxtpUrwGWUGZlrny3jnKn0cTfiQgsaAiLQEALw_wcB
Nurse Julie:
--- Quote from: Oddjob on April 22, 2020, 02:17:02 PM ---Hendersons do the same, I buy all my bearings from them, great service.
https://www.hendersonbearings.co.uk/63-22c3-ball-bearing-premium-brand-koyo-22x56x16mm.html
They also list a C4 version, no idea what the difference is between a C4 and a C3, must be one though.
--- End quote ---
C stands for Clearance Ken, ie, how loose it is.
Nurse Julie:
And if you want the real tech explanation (copied from interweb 😊😊😊😊)
C3, C4 and C5 bearings are bearings that have an additional internal radial clearance to cope with high speed environments where excess heat is generated. ... C4 and C5 are even looser still than C3 clearance bearings. This is the characteristic of these higher than normal clearance bearings marked C3, C4 and C5.
AshimotoK0:
The b*stard of a bearing to find is the ---283--- (CB450 Bonber part) output drive bearing.
Took me ages to find one NOS
oldtuggie:
Thanks guys great advice I've ordered the Koyo
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