2001 929 rear shock - Honda Motorcycles - FireBlades.org
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post #1 of 3 Old 07-20-2003, 7:01 AM Thread Starter
 
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Re: 2001 929 rear shock

...what the length is for sure? *
I ask because I want to get a Hyperco spring for the stock shock and I'd like to order the spring to have in my hot little hand to take in w/the shock for the changeover (verses removing the shock, taking it in so The Man can measure the spring, wait X days/weeks/whatever for the spring to come in, etc.)

The suspicion of a fellow I spoke with just the other day is that the 929 has a 6' spring. He measured one on an old shock. It was 6'. But if it is installed on a shock, *would 6' be compressed length?

Any input by chance, please? Thanks in advance.

bw


EDIT July 21 2003

Does the nitrogen 'leak' from the rear shock? If so, does anyone have an idea what would be symptomatic of same?

BW




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post #2 of 3 Old 07-20-2003, 9:49 AM
 
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Re: 2001 929 rear shock

but I'm sure you could allways call Dan kyle if no one answers you

Do unto others, before some prick does it to you!

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post #3 of 3 Old 08-05-2003, 5:31 PM
 
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Re: 2001 929 rear shock

Bushrod: My stock Showa spring has an internal diameter of 54mm, and a free length of 163mm. New it could have been a few mm longer. The installed length at 2 clicks off full hard preload was 154mm.
The internal diameter of the last coil is reduced by 2mm at the adjuster end to help it seat, in practice a parallel spring is fine.
I've been *told but don't know for sure that the diameter is unusual and that a replacement is not easily sourced in the US. I've also been told that the diameter is different to that on Showa race shocks. This could all be wrong.
I'm as you know running an Eibach spring, but it's probably 2-3mm larger internally than stock. Again not a problem.
If you've got a preload setting you're happy with on the standard shock you can easily calculate the free length you ideally want at the new rate. Measure your installed length at this setting in mm, subtract from 163 and multiply the resulting number by 15.3 (the stock spring rate in kg/mm) The resulting number is the preload force you want in kg. Divide the rate of your new spring in kg/mm into that number to calculate the number of mm the new spring should be compressed by to the same preload force. (it won't be more than a mm or two different to the stock no) Add it to your previously measured installed length to get the length your new spring should ideally be.
You need to offset this number by 1.15mm/preload click if you want to set it up so that you get the correct preload setting at a different clicker position.
In practice you'll be stuck with a stock spring length, and will have to adjust using spacer rings if the preload adjustment is not enough. (as in my case) My Eibach was about 11mm shorter than stock, I had to use the aluminium spacer rings I think I told you about. I'd not want to use one any shorter as it would risk coil binding or more likely over stressing at full compression.
This all worked on the button for me - I got exactly the preload I wanted at the no of clicks I wanted from the new spring.
The shock loses only tiny amounts of nitrogen pressure in normal use - mine was tested exactly the same after about 6,000m.
Have fun...



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