SP1 vs SP2 shock link - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 9 (permalink) Old 05-22-2013, 11:57 AM Thread Starter
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SP1 vs SP2 shock link

I had to look into it, since I read Subs post

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Originally Posted by SubSailor View Post
According to Mike (LDH) at Kyle Racing, the link is most beneficial for riders under 200 lbs.
Also, the SP1 had a much more progressive link ratio than the SP2 (which was changed as part of the SP2 improvements).
The link makes the link ratio more linear, which is why it is more noticeable on the SP1 vs SP2.
My bike had the link installed when I bought it, and since I too weigh over 200 lbs, I'm installing the OEM link as a test.
Also, since the Kyle link alters the link ratio, a slightly stiffer spring is needed to equate with the OEM link.
so let's see what I found so far and anybody can chime in.......


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post #2 of 9 (permalink) Old 05-22-2013, 12:01 PM
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With the swingarm update on the SP2, the linkage rate became more linear. The links themselves are exactly the same.




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post #3 of 9 (permalink) Old 05-22-2013, 12:02 PM Thread Starter
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First of all the OEM part numbers are different

SP1 link is 52465-MCF-000

SP2 link is 52465-MCF-D30

That D30 tells me that there should be differences on shape, dimensions or whatever....

So I measure them myself since I have both in my garage. I used some PLAY-DOH to help me level it and used 3 pencils that fit exactly in the bolts' holes so they are completely vertical on the paper.





Same way here



And this is the result



My Öhlins Project: https://www.rc51forums.com/forums/showthread.php?t=6033
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post #4 of 9 (permalink) Old 05-22-2013, 12:02 PM
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The SP1 & SP2 links are the exact same, the swingarm changed slightly on the SP2 adding a little more leverage to the linkage ratio.

http://www.rc51.org/link.htm
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post #5 of 9 (permalink) Old 05-22-2013, 12:02 PM Thread Starter
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And now we measure the distances





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post #6 of 9 (permalink) Old 05-22-2013, 12:04 PM
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Quote:
Originally Posted by MakisRC51 View Post
First of all the OEM part numbers are different

SP1 link is 52465-MCF-000

SP2 link is 52465-MCF-D30
The reason Honda uses different part #'s for the same parts is so they can track usage based on model. They use different part #'s for the exact same brake pads, shifter assemblies and various other parts used on multiple models.
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post #7 of 9 (permalink) Old 05-22-2013, 12:12 PM Thread Starter
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The SP2 swingarm is 10mm longer, correct?

That affects the leverage on the link. Longer lever means the same torque with less force applied.

So with the piece-of-shite OEM shock, what they actually have done is to compress the shock the same amount with less force from the rear wheel pushing the swingarm upwards.
And the rear wheel pushes the swingarm upwards during acceleration.
So the SP2 was made to abuse it's rear shock harder, if it was to be used and tested exactly the same as with an SP1 at the same track, on the same conditions etc.

What could someone achieve by that? Working the shock closer to it's limits
It causes quicker wear on it, that's for sure and heats up it's oil faster....

Just thinking.....


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post #8 of 9 (permalink) Old 05-22-2013, 12:18 PM
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The aftermarket links were never actually designed to work with the OEM shocks. The do work simply because the OEM shocks are designed to carry 2 people so they are oversprung and the aftermarket link helps to alleviate some of the stiffness, but ultimately the race links are designed for use with a SHOWA race kit shock. It just so happened that the Ohlins shock design worked flawlessly with the race link as well.
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post #9 of 9 (permalink) Old 05-22-2013, 12:36 PM Thread Starter
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Ok but I never spoke about the aftermarket link.

I compared the effects on the OEM link between the SP1 and SP2 'cause the second, forces the link to rotate with the same force but for less applied on the rear wheel due to it's 10mm bigger length....


My Öhlins Project: https://www.rc51forums.com/forums/showthread.php?t=6033
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