Rear shock upgrades - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 30 (permalink) Old 11-10-2016, 08:20 AM Thread Starter
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Rear shock upgrades

Time to start into the rear of the bike. The shock is too progressive with the rising rate making the bike uncomfortable on sharper impacts. The stock spring has end condition effectively making it progressive in its nature. Replacing it with a linear spring will help this bike enormously. A simple revalve, reducing the high speed damping will also make the bike significantly more compliant. I will also install a rebound separation valve to eliminate squating and assist with drive from the corners. This item has worked well for me on several bikes and definitely needed here. A larger reservoir volume will also create a more linear feel. I anticipate the total cost to run close to $300 but should make a world of difference. Ride height spacers will also be added.
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post #2 of 30 (permalink) Old 11-10-2016, 08:54 AM
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You seem dead set on reinventing the wheel, don't forget these bikes have been around for 16 years and all their vices (and fixes) are well known
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post #3 of 30 (permalink) Old 11-10-2016, 02:57 PM Thread Starter
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Originally Posted by dansp1 View Post
You seem dead set on reinventing the wheel, don't forget these bikes have been around for 16 years and all their vices (and fixes) are well known
I made a square wheel once but it was too bumpy on the faster sections. Then a freind pointed out that if I made a triangular one there would one less bump per rotation.
Just another example of the benefits of "brainstorming"

Dan
Its pretty hard to anything about this bike that hasn't been said before.
If you are all too familiar with the bike and this information is too "Yesterday" for you, I can't help that. I'm sure that there are other guys like myself who have recently joined this forum and would still like to share information. Most of the threads here are older than the bikes we are riding. Adding something current can't hurt.
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post #4 of 30 (permalink) Old 11-10-2016, 05:38 PM
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Originally Posted by Way2Slooow View Post
Most of the threads here are older than the bikes we are riding.
FWIW, this forum is newer than any model year RC51, but let's not have facts get in the way of things here.

Without the hyperbole, by all means share your work. Though imo most of your forum posts so far would be best presented combined in your own bike build thread.

Last edited by kwtoxman; 11-11-2016 at 08:32 AM.
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post #5 of 30 (permalink) Old 11-10-2016, 08:28 PM Thread Starter
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I did start this thread.
I somehow thought this was the appropriate section for suspension mods.
Many things are said "Tongue in cheek", but the square wheel story is absolutely true.
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post #6 of 30 (permalink) Old 11-11-2016, 06:27 AM
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The OP has been a member here less than a month and has already contributed a considerable amount IMO, it generally takes time for new members on any bike forum to get a feel for the environment but I don't understand the negativity. I just bought a second SP-2 and plan to upgrade the stock shock myself if I can. I'm not expecting the performance equivalent of top-line aftermarket kit but I've been impressed in the past with re-valved and re-sprung Showas on other bikes so any related information that goes deeper into what's involved than "buy the XXXX and be done with it" or "just send it to whoever" is gold as far as I'm concerned. As Way2slooow pointed out he did start the thread, in the suspension sub-forum. If people aren't interested, or think there's nothing left to learn, fine, let them look elsewhere. I am.

Way2Slooow please continue. And post pictures.
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post #7 of 30 (permalink) Old 11-11-2016, 06:36 AM Thread Starter
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JB
Thanks for the support.
I mentioned on another thread that my standard shock will go on the dyno tomorrow. I will place some pictures to demonstrate the process. I would be happy to share information with you given that you are going through the same thing right now. Do you have access to springs and are you able to make valving changes?
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post #8 of 30 (permalink) Old 11-11-2016, 07:07 AM Thread Starter
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One thing I will be doing is machining a larger reservoir cap which will make the shock more linear. PM me your address and I will post you one.
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post #9 of 30 (permalink) Old 11-12-2016, 02:37 AM Thread Starter
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The shock is now done.
New Eibach spring. No end condition. The end condition in the original spring took nearly 30mm before the first coil contacted the 2nd and then the spring rate became linear. If you set your sag on this bike it will be done in the softer range for most people and then the spring will transition to its harder rate a little further into the stroke. Revalved for a hopefully plusher / more controlled ride. Rebound separation valve installed and a larger gas volume reservoir cap from Race Tech. Most of the steps taken will reduce the progressive nature of this shock and make it more linear, more controlled. Looks good on the dyno. Road testing tomorrow.
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post #10 of 30 (permalink) Old 11-12-2016, 03:02 AM
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From "machine" to "bought from Race tech" in one post?

this, and most of your other posts, would really be helped by pictures so we can see what it is you are up to
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