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Re: Fork Measurements Are Needed [Re: Magnetoman] #762203 01/10/19 11:42 pm
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Magnetoman Online Content OP
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Originally Posted by Irish Swede
when this is all sorted out, will you be releasing a revised, updated edition of your book?
All sorted out? That could take a very long time indeed. Would you settle for quite a bit sorted out?

For what it's worth I continue to collect and organize whatever new Gold Star-related material I find but I have no plans for what to do with it in the foreseeable future. That said, I consider the loss of the Competition Shop's records when John Gardner died to be a tragedy of biblical proportions, and I have an academician's interest in not just preserving information, but preserving it in a way that makes it accessible to as many people as possible.

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Re: Fork Measurements Are Needed [Re: Magnetoman] #762290 01/11/19 6:50 pm
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Gordo in Comox Offline
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MM: I agree with you on the sad loss of the Comp Shop's records. For example I have the remains of a ZB34 GS engine that does not appear in the GS despatch records. Back in 1999 Ian contacted John Gardner and he found it in the "Iron/Alloy engine Competition Records" as going out in a ZB31 S plunger frame, "Scrambles" equipment to Hap Alzina in California in 1951. This info gave me a real insight into the history of what I had. John later confirmed that the head on the engine was a true GS head and not just a ZB33A alloy option head.

The strange thing was that even though the cases are stamped ZB34 GS, they are not the big bearing cases but the small bearing version. This might have contributed to the engine blow up.

Gordo


The roadside repairs make for the best post ride stories.
Re: Fork Measurements Are Needed [Re: Magnetoman] #762390 01/12/19 6:50 pm
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flowboy Offline
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Magnetoman,
I much admire your perseverance in these matters!
I was driven mildly insane when looking into the steering yoke issue when I discovered there were so many hidden variations. Not helped in the least by the fact that many have no casting / part numbers on them.
http://www.britbike.com/forums/ubbt...a-pre-unit-yokes-triple-trees#Post726089

Fork stanchions appear to be another minefield! Unfortunately my bikes all have replacement stanchions. There may be an odd one or two "originals" lurking in the basement. Will check.


na
Re: Fork Measurements Are Needed [Re: flowboy] #762397 01/12/19 7:56 pm
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Magnetoman Online Content OP
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Originally Posted by flowboy

I much admire your perseverance in these matters!
I was driven mildly insane when looking into the steering yoke issue when I discovered there were so many hidden variations.
Thanks for your comment. I hadn't seen your earlier thread but I would have been surprised if I were the only one being driven insane by this.

I took a few minutes from my writing assignment to take photos of four variations of bottom yokes I found on the self and had sitting on the garage floor. Note the difference in location and size of the steering stops, the presence or absence of tapped holes in the stops, and whether the yokes have a dimple or a hole. The inset has yokes back-to-back to show two of the fork stops in greater detail. I don't know what models these yokes are from, nor if there are additional variations, but the photograph illustrates at least some of the variables we're dealing with.

p.s. it's not clear from the photo but the yoke at the right has a dimple. Counting the two others that are the same as ones in this photo, and three that are on my bikes, that makes nine yokes in my collection that either have a dimple, or a hole in place of the dimple. At least that's one feature that's easy to look for even if we don't yet know which bikes should have dimples and which should have holes.

Attached Files Yokes_bottom01.jpg
Last edited by Magnetoman; 01/12/19 8:11 pm. Reason: p.s.
Re: Fork Measurements Are Needed [Re: Magnetoman] #762414 01/12/19 10:24 pm
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Gordo in Comox Offline
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MM: The black yoke on the left in your photos is a rigid/plunger unit where the high nubs (when sitting upright ) butt against the frame as per this photo. The others have the low nubs that hit the steel plate that is part of the steering damper for the S/A frames.

Gordo

[Linked Image]


The roadside repairs make for the best post ride stories.
Re: Fork Measurements Are Needed [Re: Gordo in Comox] #762421 01/12/19 11:25 pm
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Magnetoman Online Content OP
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Originally Posted by Gordo in Comox
The black yoke on the left in your photos is a rigid/plunger unit
Thanks very much for that. Thanks to this information, plus the information you posted in another thread about plunger fuel tanks, I now know I have two components for a ZB Gold Star. This means I only have to source a few more components and I'll be able to build a complete machine...

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