Anti-dive

How to make an old bike handle like a new (factory) one!
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moizeau
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Joined: Sun Oct 15, 2023 11:45 am
Location: France

Anti-dive

Post by moizeau »

Hi all. I'm rebuilding a GPz11 A1 and was about to order the rebuild kit from GpzZone but they have ceased to exist. I have read through many of the related topics on here but haven't found the answers I'm after.
Basically I need a set of O-rings including the X-ring.
Does anyone on here have the dimensions for a complete kit so I could order them from a bearing/oil seal supplier please?
I have the drawings for the blanking plate (including the slot) but would rather repair the AD units if possible.
Thanks very much.
Pete
Kawadoodle
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Re: Anti-dive

Post by Kawadoodle »

The x ring, I assume to be the seal which is a moulded seal onto a metal ring? If these are what you mean, they were discontinued from Gpz Zone kit some time ago. I had to re-use mine. I kept the parts I removed on the last rebuild. I'll measure the orings up in the week when I get into work. However, other than the x ring, there's a 6 x 30mm spring that collapses with wear, I don't know where you can source these, not unless there's a spring manufacturer who could copy them for you.
moizeau
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Location: France

Re: Anti-dive

Post by moizeau »

Thanks for the reply. The X ring was originally a square O-ring I believe. On the the 13/14mm head grub under the circlip? Any measurements you can offer will help loads. Cheers
I read a post earlier where a chap on here had them made but that was a couple of years ago
Kawadoodle
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Re: Anti-dive

Post by Kawadoodle »

I know the one you mean, I bought a set from Adrian who sold them on this forum. I've kept them for spares but i can measure those too and send the sizes over.

I contacted Adrian just now, he doesn't have them anymore, he sold all the ones he had around 2018.
moizeau
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Re: Anti-dive

Post by moizeau »

Thanks very much indeed
Kawadoodle
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Re: Anti-dive

Post by Kawadoodle »

Hi,
Measurements on my kit in mm are:
X ring, not X but square profile:
OD 15.30
ID 10.30
Height 3.30

Adrian said the material used for above was nitrile with 70 shore hardness

Transfer port O ring x4:
OD 15.9 probably 16mm
ID 11.00

Plunger housing O ring x2:
OD 20.50
ID 15.50

Lower plunger x2:
OD 9.45
ID 6.00

Spring
Length 36
OD 7.10
ID 5.10
Wire 1.0
18 coils closed on ends and ground square.
Rate not measured

Regards
Julian
Kawadoodle
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Re: Anti-dive

Post by Kawadoodle »

That's 2 springs.

Qtys are to service 2 anti dive units, 1 bike.
moizeau
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Location: France

Re: Anti-dive

Post by moizeau »

Thanks Julian, very much appreciated. Off to check availability of given sizes.
Cheers
Pete
Kawadoodle
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Re: Anti-dive

Post by Kawadoodle »

Did you manage to source any of the parts?
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