SOHC.co.uk Forums > CB350/400

head bearings

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rigwit:

--- Quote from: Bryanj on October 23, 2010, 10:41:02 PM ---You can't get them from a bearing supplier as the outer race is ground special to fit

--- End quote ---

not quite,,,,,,  back when i had to source them it used a british imperial top bearing and a iso metric for bottom..... good old british timken...... and steve, i cant say from my experiance what its used for or where it goes but perhaps the following may help you determin where it goes...............

when i did mine getting the lower headstock inner race off, entailed starting it by hitting the lower washer with seal  this wasnt a problem in the 70,s as replacement parts were still available, if the "hole" in the washer will fit over the larger lower bearing land then it may be a replacement for this.......if its inner diamiter will fit over and its outer is 50mm then it could ,depending on how deep the inner race wall is to be a spacer before inner race is fitted.......on ds site it looks a fair old washer....... so without doing it i cant say 100% where it goes perhaps someone else has done it with the ds bearings  or give em a ring and check before fitting..................

Bryanj:
When i tried, the inner race was from one bearing set and the outer race from a different bearing set, for both top and bottom, so you had to buy 4 bearings to get 2 and that assumed the tapers were ground on the same angle, which different manufacturers dont. So if you got all 4 from one maker you had a chance but the cost was more than buying the Japanese set where the outside of the outers were ground to a "Non Standard" size

rigwit:
years ago there were many many plethora of bearings than there are today.....most post 90,s seem to be made for application  ie the part to a standardized bearing, although a GOOD bearing stockist will have a cross cat that can mix a 2 or 3 part bearings to suit.....even using sleeves

long gone are the times you could get anything from 30 degree to a 70 degree annular outer/inner from different manufacturers and find a spot on one.

rigwit:
 got them from d/s

neilma:
Hi Steve,

I just fitted these myself this week.. The quick answer to your question is that the washer that came with the kit goes on the stem 1st then the race.

I worked this out by building on my bench the lower race (inlcuding a few of the balls) to get the height of the original lower bearing race. Then put the new one up against it. To make them the same height the washer was required.

Anyway, I fitted the race to the stem (I put the stem in the freezer overnight) and then put the bearing in the oven for a while and used a piece of 1.25" PVC pipe to bang it on. I then reused the rubber washer by stretching it back over the race to rest between the race and the washer. You can then reuse the original washer and chrome nut on the top.
Hope that helps

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