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Steering Yoke Ball Bearings 400/four

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McCabe-Thiele (Ted):
I understand most of the wear force sits on the lower bearing so am wondering if a hybrid arrangement  is more practical - taper bearing at the bottom plain at the top ?

Then again for my likely low summer mileage perhaps original is more straight forward ?

Bryanj:
I found the problem is if you use a thin spacer the bottom yoke came up against the frame and thinest spacer i found was 1mm.
Possibly you could grind some off the frame at bottom but not tried that

McCabe-Thiele (Ted):

--- Quote from: Oddjob on February 08, 2021, 10:30:19 AM ---According to the parts diagram and the manual there are 37 ball bearings, 19 in the top and 18 in the bottom, they are called #8 ball bearings which according to the web means 1/4".

Like these.

https://simplybearings.co.uk/shop/product_info.php?products_id=38916&vat_inc=true&gclid=Cj0KCQiA34OBBhCcARIsAG32uvPGEh1MrUYLnvlT3sG_BtrNgFn62NT0DsiaJaeC6kmnygPfawxXsMwaAi_OEALw_wcB

£4.33 for 50.

--- End quote ---

Thanks for the link I have ordered some. I'm probably stuck with DS for the upper & lower races I think it works out at almost £70 for the pair!

McCabe-Thiele (Ted):

--- Quote from: TrickyMicky on February 07, 2021, 11:13:57 PM ---Please forgive me if I've missed something obvious, but if you've gone to all the trouble of dismantling the front end, surely it's a lot less hassle just to replace the whole lot with a set of taper roller bearings. From the way I've read it, it gives the ipression that you are leaving the old races in place and just renewing the balls?

--- End quote ---

Having priced up the parts from DS I'm looking again at your suggestion to fit taper rollers they do seem a cheaper & better option. I've found these on e-bay after a search. What's the catch probably do not fit!! The lower race has a larger OD than the upper one.

https://www.ebay.co.uk/itm/Steering-bearings-taper-roller-Honda-CB250-350-400-450-500-550-650-750-super/153984339007?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649

And a spacer https://www.ebay.co.uk/itm/Honda-CB-400-F-Four-75-79-Headstock-Steering-Taper-Bearing-Spacer-OE-324005/184349619747?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649

https://www.ebay.co.uk/itm/Honda-CB-400-F-Four-1975-1979-Headstock-Steering-Taper-Bearing-Top-OE-324803/184340453514?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649

Clearly I need to get my calipers on the old races.

McCabe-Thiele (Ted):
I've found what sounds like a supplier that will sell me a pair of bearigs with a spacer to suit. Currently out of stock in the cheaper option for my particular model of Honda but the dearer option is £30.00.

As & when the bits arrive I will update with details of my fittment experience.

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