Constant rate springs - SV1000 Portal
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post #1 of 12 (permalink) Old 24th March 2019, 01:36 AM Thread Starter
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Constant rate springs

I have my forks off and taken apart. Iím now thinking good time for a spring upgrade. Iím doing oil, seals, and bushings. Iím going to leave the forks otherwise stock. I have other bikes for my track and aggressive riding needs. I have upgraded all suspension on both my 1st and 2nd gen sv650sís, including constant rate springs. Their forks suck stock. The sv1000s forks arenít that bad to me though, itís a 2004. Can somebody with experience tell me of constant rate springs are a worthy upgrade?
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post #2 of 12 (permalink) Old 24th March 2019, 01:43 AM
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i had progressive suspension brand for a while but they were too stiff for my body weight. i now have hyper-pro straight coils fitted for me. they work very well. the stock dampers still suck but im too cheap to stick $500 emulators in there for street riding...ps my progressive suspension set is for sale.(cheap sales plug)

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post #3 of 12 (permalink) Old 24th March 2019, 04:38 AM
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Originally Posted by falconbobb View Post
i had progressive suspension brand for a while but they were too stiff for my body weight. i now have hyper-pro straight coils fitted for me. they work very well. the stock dampers still suck but im too cheap to stick $500 emulators in there for street riding...ps my progressive suspension set is for sale.(cheap sales plug)

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Emulators!?!?

The SV1000 has cartridge fork already so why would you attempt to fit a cartridge emulator in that is designed for a damping rod type fork?

-ms


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post #4 of 12 (permalink) Old 24th March 2019, 10:11 AM
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you are correct, i did this a while back and emulators was the only word that came to mind in the moment to describe the dampning alterations...bottom line, it was not worth the price to ME.

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post #5 of 12 (permalink) Old 24th March 2019, 08:04 PM
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Yes....absolutely a set of straight-weight springs are worth their cost. Also note that the SV1K forks don't like real heavy oil....you might start around 2.5w at most and see how much authority the adjustment screws give you. I had 5w Maxima (of course...different brands will change how they work at the same rated weight...so experimentation is needed) and it was way too thick....have 2.5 Redline in there now which seems to work well. The later forks are a bit different and might have shim stacks that change the oil requirements...but the suggestion to start light and work your way up until you get enough damping I think is a good one.
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post #6 of 12 (permalink) Old 27th March 2019, 01:19 PM
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Race Tech springs and Red Line oil when properly selected and applied will work miracles with stock forks.
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post #7 of 12 (permalink) Old 1st April 2019, 09:32 AM
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Yep race tech linear springs are good. I found .9 a bit soft for the track. .95 were good. I weigh 87kgs
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post #8 of 12 (permalink) Old 1st April 2019, 11:21 AM
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Here's an interesting article regarding straight and progressive springs and where one might be more suitable over the other.
https://motorbikewriter.com/progress...jl0A_dt87Nqpks
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post #9 of 12 (permalink) Old 2nd April 2019, 02:54 AM
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Originally Posted by tzk321 View Post
Here's an interesting article regarding straight and progressive springs and where one might be more suitable over the other.

https://motorbikewriter.com/progress...jl0A_dt87Nqpks


Interesting write up. In many cases I can see a progressive rate spring being to your advantage, but often what is available is too progressive. Too soft at the initial part of the spring deflection causes user to crank up preload to get the right sag. As you add preload the spring starts to move into the stiffer rate section of the spring causing it to become over spring. A spring that is 70/100N/mm at the 20/80% gauge points will be far different than an 85/100N/mm at the 20/80% points.

What they also fail to mention is that the bike they mention is not a linkage type bike. Linkage often provides the progressiveness in the system, so adding in a progressive spring in the rear is not common on most bikes unless they are linkless.

Total rate progression of the fork is tunable by fork oil level also. As in the initial part of the the fork travel has much less dependence on oil level than mid stroke and on due to the higher air pressure in the fork for a given point in the travel.

Just my 2 pennies.

-ms


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post #10 of 12 (permalink) Old 3rd April 2019, 03:05 PM
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Originally Posted by schmidt314 View Post
Total rate progression of the fork is tunable by fork oil level also. As in the initial part of the the fork travel has much less dependence on oil level than mid stroke and on due to the higher air pressure in the fork for a given point in the travel.
This! Exactly!!
You couldn't pay me enough to put progressive rate springs in my forks. In modern designed forks that are properly set up they are completely unnecessary.

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post #11 of 12 (permalink) Old 5th April 2019, 05:42 AM
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I ran Race Tech springs and i went to 5w Motul Factory Line......
Race Tech stated that 130mm oil height was the recommendation....i ended up with 127mm after experimentation....

Worked a treat for a long time, but, eventually the legs were seriously worn out and i changed to GSXR front end....

I also tried, stupidly, 7.5w....with the stock springs......it was amazing on super smooth roads, but, if you ran over a beetle, it nearly broke your wrists.....LOL
Then, coming down a super steep hill, i blew a fork seal.....maybe it was the fluid, maybe it was the springs not being up to it....replaced the seal and went to 5w and never had an issue again.....

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post #12 of 12 (permalink) Old 5th April 2019, 05:20 PM
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I ran Race Tech springs and i went to 5w Motul Factory Line......

Race Tech stated that 130mm oil height was the recommendation....i ended up with 127mm after experimentation....



Worked a treat for a long time, but, eventually the legs were seriously worn out and i changed to GSXR front end....



I also tried, stupidly, 7.5w....with the stock springs......it was amazing on super smooth roads, but, if you ran over a beetle, it nearly broke your wrists.....LOL

Then, coming down a super steep hill, i blew a fork seal.....maybe it was the fluid, maybe it was the springs not being up to it....replaced the seal and went to 5w and never had an issue again.....


Are you telling me you can feel a difference between 127mm and 130mm fork oil level!?!?

-ms


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