Preload adjusters - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 7 (permalink) Old 08-05-2014, 07:51 PM Thread Starter
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Preload adjusters

So I picked up some used forks. Accordinh to previous owner it had an extra spacer for preload. Took off fork cap and took out the extra spacer. After reinstalling and tightening up the cap, now I can't adjust for preload. Any suggestions?

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post #2 of 7 (permalink) Old 08-05-2014, 08:05 PM
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Have you compared the parts your fork has with the service manual?

Is it SP1 or 2?


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post #3 of 7 (permalink) Old 08-05-2014, 08:06 PM
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Do you have a photo of the extra spacer?
Are these SP1 or SP2 forks? The fork caps and preload adjusters are not the same between the two.
Will the preload adjuster turn at all either way?
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post #4 of 7 (permalink) Old 08-05-2014, 09:50 PM Thread Starter
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They are SP2, the spacers looks like a 2 inch pvc they put in. The pre load adjust er will turn only loosening the lock nut.

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post #5 of 7 (permalink) Old 08-06-2014, 01:53 PM
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So when the large black preload adjuster nut is turned, it instead loosens the thin black lock nut under the preload adjust nut?

The design of the SP2 preload adjuster is fairly simple, and I'm not as yet, fully understanding how it wouldn't allow adjustment.

Unless possibly the custom PVC preload spacer has too much wall thickness, and not fitting around the adjust case freely.

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post #6 of 7 (permalink) Old 08-06-2014, 08:36 PM Thread Starter
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I removed the spacers so I can get it back to stock. So yeah if I try to adjust to make it stiffer it doesn't budge but when I try to soften it, it will start unscrewing the lock nut. W
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post #7 of 7 (permalink) Old 08-06-2014, 10:17 PM
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Do you know if the springs have been changed out with aftermarket springs?
When you removed these short spacers, did the forks drop in height equal to the short spacers removed?

I'm thinking possibly that the forks springs may have been changed out, but with shorter springs than OEM, and the spacers are making up the difference in length rather than a longer custom spacer made or obtained.
Is the OEM spacer still inside?
The OEM SP2 spring length is 244mm and the SP1 fork spring is 250mm.

Then you're trying to add preload with the shorter springs and the adjuster plate is bottomed out against the stopper ring at the bottom of the fork cap. That's why it won't budge anymore.
You'll need to check the current spring length to verify this.

The adjust case lock nut is not tightened so it loosens when the adjust case is rotated.

That's my theory so far.



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