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Fork tops

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theone&onlymin View Drop Down
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    Posted: 22 Mar 2018 at 13:38
So I'm rebuilding a set of forks on my G5 using twin springs. And today's question is....

Which top do I use ?



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Min
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 22 Mar 2018 at 14:00
Top one looks very like what was in my 850 Le Mans. I always assumed springs were OE but as the PO did a lot of custom work on it can't be sure of that.




"Chicken nuggets don't dance on a Tuesday."
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jpc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 22 Mar 2018 at 14:10
Don't KNOW but I'd start by trying both, maybe the longer one is necessary to give at least a slight preload to you particular springs.
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 22 Mar 2018 at 14:11
Yes try it and see! Big smile

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johnno View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnno Quote  Post ReplyReply Direct Link To This Post Posted: 22 Mar 2018 at 17:43
Originally posted by jpc jpc wrote:

Don't KNOW but I'd start by trying both, maybe the longer one is necessary to give at least a slight preload to you particular springs.
agree
GSXR1100 L ,Moto Guzzi 650tt/ntx.750xpa,t5 850.1100 sport,1100 sport corsa rider
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theone&onlymin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote theone&onlymin Quote  Post ReplyReply Direct Link To This Post Posted: 22 Mar 2018 at 18:18
I'll go for the preload option so I will. It's going to be lovely anyway as the front end has had zero attention for a looooooong time.

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Min
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jpc View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpc Quote  Post ReplyReply Direct Link To This Post Posted: 22 Mar 2018 at 18:57
Out of curiosity, Min, what are 'twin springs" ?

I only know about single  rate & progressive...
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theone&onlymin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote theone&onlymin Quote  Post ReplyReply Direct Link To This Post Posted: 22 Mar 2018 at 20:21
There is one short and one long spring per leg. I guess giving dual rate whatever that means.
Research  and Mike say that the fork tops are from Le Mans 1 . All they will do is add preload.

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Min
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 22 Mar 2018 at 21:46
The Spada III and Cali III had twin springs each side, to give some sort of progressive springing.
The SPIII seems to have the short top nuts.
Brian.

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theone&onlymin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote theone&onlymin Quote  Post ReplyReply Direct Link To This Post Posted: 26 Mar 2018 at 13:57
Good plan until I found my stanchions.
Long tops are 31mm diameter.
Short tops are 29mm so that's what is going in.
Pushing against the ground test shows adequate preload for the time being.

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Min
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