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 Shock spring rate change through model years?

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johnkol




PostSubject: Shock spring rate change through model years?   Sat Nov 04, 2017 1:32 am

Looking through all available sources, everyone seems to agree that the spring rate of the stock shock is 7.7 kg/mm. That is also the value the Race Tech chart displays for the 2008 and 2009 WRR:



But for 2010 and beyond, Race Tech is showing that the stock spring rate is 8.2 kg/mm:



Has anyone encountered this before? I cannot find any other sources to corroborate this information.
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YZEtc

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PostSubject: Re: Shock spring rate change through model years?   Sat Nov 04, 2017 5:32 am

The parts catalogue I viewed shows the exact same part number for the rear shock assembly (spring and all) used from 2008 to 2016.
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wwguy

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PostSubject: Re: Shock spring rate change through model years?   Sat Nov 04, 2017 11:04 am

The Yamaha service manual chassis specifications section shows 80.00 N/mm (456.80 lb/in) (8.16 kgf/mm) for all model years.
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johnkol




PostSubject: Re: Shock spring rate change through model years?   Sat Nov 04, 2017 2:17 pm

wwguy wrote:
The Yamaha service manual chassis specifications section shows 80.00 N/mm (456.80 lb/in) (8.16 kgf/mm) for all model years.

This is the free manual downloaded from the web, right? I have the same one, and people have stated that this is a pre-production version with a lot of errors.

Even Go-Race have stated on this forum that the shock spring rate is 7.7 kg/mm:

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wwguy

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PostSubject: Re: Shock spring rate change through model years?   Mon Nov 06, 2017 6:27 pm

johnkol wrote:
This is the free manual downloaded from the web, right? I have the same one, and people have stated that this is a pre-production version with a lot of errors.

The first-edition PDF manual published in 2007 shows the same suspension specs as the 2008-2015 printed manual in my workshop. The older PDF version does contain several errors, mostly in wiring schematics.
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johnkol




PostSubject: Re: Shock spring rate change through model years?   Mon Nov 06, 2017 6:52 pm

wwguy wrote:
The first-edition PDF manual published in 2007 shows the same suspension specs as the 2008-2015 printed manual in my workshop.  The older PDF version does contain several errors, mostly in wiring schematics.

Any idea then why people are quoting 7.7 kg/mm as the shock spring rate? Where is this value coming from if the manual has been stating 8.2 kg/mm right from the beginning?
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