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 Post subject: Headset bearings
PostPosted: Tue Jul 12, 2016 6:17 pm 
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Thumper Pilot

Joined: Sat Mar 26, 2016 2:58 pm
Posts: 385
Location: Bristol, England, UK
Got a new set of loose ball bearings, bottom ones look ok but for some reason the top looks like I'm one short. Im pretty sure they are 5mm bearings and the qty is 22 same as the book but there is a gap in the top and when I fit it all together it feels like a bag of crap, does Anyone know the original ball bearing sizes? Either I need bigger top ball bearings or I need 23 not 22?


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 Post subject: Re: Headset bearings
PostPosted: Tue Jul 12, 2016 6:24 pm 
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Joined: Fri Oct 15, 2010 4:51 pm
Posts: 4781
Location: Lincolnshire UK
Im sure there are 22 balls in the set, do you have a parts manual.

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 Post subject: Re: Headset bearings
PostPosted: Tue Jul 12, 2016 6:28 pm 
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Thumper Pilot

Joined: Sat Mar 26, 2016 2:58 pm
Posts: 385
Location: Bristol, England, UK
Yes it says 22 but there is a gap big enough for another bearing at 5mm so not sure if they've supplied the correct bearings. Bottom ones are bigger and they are tight together at 19 balls.


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 Post subject: Re: Headset bearings
PostPosted: Tue Jul 12, 2016 6:33 pm 
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Thumper Pilot

Joined: Sat Mar 26, 2016 2:58 pm
Posts: 385
Location: Bristol, England, UK
Here, I've removed the grease to show you, does this look right?

Image


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 Post subject: Re: Headset bearings
PostPosted: Tue Jul 12, 2016 6:37 pm 
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Location: Lincolnshire UK
Right , 22 balls 3/16".

No work on the engine for the week as im waiting for the barrel to be re bored,
been told the chap who does it was off ill last week.

TTB

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 Post subject: Re: Headset bearings
PostPosted: Tue Jul 12, 2016 6:51 pm 
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Thumper Pilot

Joined: Sat Mar 26, 2016 2:58 pm
Posts: 385
Location: Bristol, England, UK
No worries, I see you have your hands full with that lovely '76. In new money that's 4.75mm so I wasn't far wrong, I just don't understand why there's a big gap. Do you have a measurement for the bottom TTB? They are tight together and if the top Is correct it must be the bottom giving me the lumpy feeling. I may just bin them and get the tapered bearings, how easy is it to fit the cups?


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 Post subject: Re: Headset bearings
PostPosted: Tue Jul 12, 2016 6:56 pm 
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Thumper Pilot

Joined: Sun May 24, 2015 7:51 am
Posts: 391
Location: Newcastle, UK.
Did you get new races too, if not, are the old ones perfect?
Other loose ball races I've fitted on other bikes usualy look like there is a gap for one more, but run fine without, which is why I ask about the races (cup and cone).


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 Post subject: Re: Headset bearings
PostPosted: Tue Jul 12, 2016 7:10 pm 
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Thumper Pilot

Joined: Sat Mar 26, 2016 2:58 pm
Posts: 385
Location: Bristol, England, UK
Could be the lower race, top looks ok. I'll see if I can get a replacement.


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 Post subject: Re: Headset bearings
PostPosted: Tue Jul 12, 2016 7:13 pm 
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This should help but my honest opinion is dont fit taper bearings as
they will sit about 4mm higher which will leave you with very few threads on the lock nut.

Image

TTB

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 Post subject: Re: Headset bearings
PostPosted: Tue Jul 12, 2016 8:06 pm 
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Thumper Pilot

Joined: Sat Mar 26, 2016 2:58 pm
Posts: 385
Location: Bristol, England, UK
Doh, just bought the tapered ones.


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