SOHC.co.uk Forums > Project Board
1967 CB450K0 Black Bomber Rebuild - By Royhall
royhall:
That's a shame Ash it's a very good hub other than that. Is the crack at 9 o-clock on the picture. I'm in no rush for it so whenever you can get back in there is good. Can't think of any reason a good welder couldn't repair a crack like that and save an otherwise good piece?
AshimotoK0:
Well a trip to my stash of bits across town and more bad news. I had two more wheels .. one hub looked perfect but when I cleaned it up there was a minuscule crack on one cush drive area and the other one had a crack too ...nothing a bad as yours Roy but neverthless that's 4 of the b*ggers now including yours that we have found that are cracked to some degree. So I hightailed it to work to find the 500T one I got on a wheel my mate gave me to rob for it's rim and spokes but could't find it.... turned out it was in my garage at home all along :-[ . Inspected it and it looked very similar to the Bomber ones and all parts of casting around the cush drives are perfect but on closer inspection it's overall a bit taller than the Bomber one.
So that's both of us looking for a rear hub now unless they can be welded. :(
I will ask on the Bomber Facebook group if this is a known common fault. My guess is that loads of them from UK bikes with decent mileages will be the to same to some degree. My CB500T one was from a USA import bike my mate got from Summerbud. I bet loads are cracked and nobody has noticed ... the cracks are very difficult to distinguish from casting flash marks in some cases.
[ Guests cannot view attachments ]
[ Guests cannot view attachments ]
royhall:
What are they like on sprocket position as it may just be the bearing retainer sleeve is different. Loads of people are selling 500T hubs as 450, is it just the K0 that's different to the rest. have you got a later 450 hub you can check against the K0.
They can't be vastly different as I know it's possible to fit a 500T engine straight into a bomber. Maybe they beefed it up at some point to stop the cracking.
Been watching one all week advertised as cb450/cl450/500T that the seller says has no cracks, he's also sure it will fit so I have put a sniper bid on. Finishes in 16 minutes so I may be the owner of more scrap iron.
Cheers.
Laverda Dave:
I'm sure there are wheel specialists out there who can repair the cracks. Alloy wheels on early Porches were prone to stress cracking. These can now be repaired (I've seen it done on Wheeler Dealers!). The crack is ground out, filled by welding, dressed and polished. I'm sure they can undertake the same repair on these hubs?
Trigger:
I can repair those hubs but, it is always a bit of a gamble with jap cast alloy in a stress area. The weld is pure alloy which is stronger than the cast and though it will not crack in the same place the stress can be transferred to another weak part of the cast alloy, that may crack again in the first month of may take a few years. All depends on the stress level . This will happen to about 12% of the hub repairs I do .
Just had a scan of the picture of the hub and those cracks look like they were made when the bushes were pressed in :o
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version