Which springs for fork upgrade - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 15 Old 04-14-2009, 09:03 AM Thread Starter
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Which springs for fork upgrade

Hi. I want to improve the forks on my '08 650. Does anyone have any suggestions for springs? Over here in Greece, my choices are Hyper-Pro and White Power. I went to 2 shops and 1 liked the HP's and the other liked the WPs. I could get Sonics by mail order. Also, should I do the valves as well? The shop with the HP's said no. Is that good advice?

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post #2 of 15 Old 04-14-2009, 10:02 AM
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I don't believe that there is any difference between springs from different manufactures as long as they are rated the same. Some might have tighter controls on them but it is not that much of a difference to notice.

If you need to respring you should revalve (at least redo the shim stack) at the same time. They work together. If you go heavier with the spring then it would be a good idea to increase the compression and rebound damping at the same time. Race tech gold valve cartridge emulators are a good idea as well.

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post #3 of 15 Old 04-14-2009, 10:32 AM
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Linear not progressive

I believe the main thing here is to get linear springs and not progressive springs

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post #4 of 15 Old 04-14-2009, 11:24 AM
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Quote:
Originally Posted by 10guy View Post
I don't believe that there is any difference between springs from different manufactures as long as they are rated the same. Some might have tighter controls on them but it is not that much of a difference to notice.

If you need to respring you should revalve (at least redo the shim stack) at the same time. They work together. If you go heavier with the spring then it would be a good idea to increase the compression and rebound damping at the same time. Race tech gold valve cartridge emulators are a good idea as well.
The 650 uses a damper rod fork (no valves), unlike the 1000.

I have Sonics (.90) in my Wee, with 15w oil, and Race Tech emulators. A huge improvment over the stock set up, and allows you to adjust your compression dampning. I also have a SuperBrace on the forks.

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post #5 of 15 Old 04-14-2009, 01:47 PM Thread Starter
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Yup, I already have the superbrace. What's wrong with progressive springs?

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post #6 of 15 Old 04-14-2009, 07:14 PM
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I just went through all of this stuff with my bike in the thread below this one... I suggest you check it out. While a lot of people swear by the advice provided above, there are a lot of people that also have done the advice above and have, not regretted purchasing all that stuff, but wished they had done a little more to resolve the issues they felt before spending the money. There is A LOT of things you can do to the bike before you go spending $100 on springs, and whatever on a gold valve emulator. For instance, just changing the oil weight itself, $13 or so will get both forks done along with a little bit of time and patience.

Just so you know...progressive fork springs (not the company progressive forks) but the actual springs themselves, are already in the bike. Which is why people are using the other springs. Sure, another weight progressive spring may change things, but another weight straight spring, etc. may do wonders. You're going to want to do a lot of research, ask a lot of vendors what they recommend for your weight and the riding style and types of roads you plan on riding. They'll make suggestions on oil weight, springs and of course every single one will probably tell you to get the gold valve emulator. I would suggest you start off with the first thing, oil wt. See what you can do mixing, or just going with a heavier wt. itself. The stock wee comes with 5wt. oil, which is why you get a little more dive then not. You can adjust the dampening rods as well (free). Between those two, you spent $13 or so and you'll learn a lot. If you take it a step further, you can do 50/50 mixtures or even 25 / 75 mixtures with different oil weights to try to fine tune the forks that way. If none of that works, then go to the next item, the fork springs and you'll want to experiment with the oil wt. using those springs. Very last thing would be the emulator, if needed at all.

I'm by no means an expert. But $13 and 2hrs. saved me from spending close to $500 on an upgrade myself. The previous owner of my bike had 20wt. oil in the forks and the dampers completely down to 0. Felt like I was driving a jeep down the highway as I bounced over every nook and cranny. Emptied out the 20wt. and added 10wt. Much better ride. Am I 100% happy...it could be better I suppose, but I want to see how this rides on multiple surfaces before taking it to the next step of possibly doing a mixture of 10 and 15wt.

Just some food for thought...

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post #7 of 15 Old 04-14-2009, 10:48 PM
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Code, how are you saying you can adjust the damper rods on a Wee? There is no adjustments. You can adjust the spring preload to set sag but thats about it. Playing with the oil will only take you so far, but yes its a start.

If a fella does his own work, its a far cry from the 500 clams you are quoting. Sonics run around 100.00 and the emulators are around 150.00. For some maybe not cheap, to others well worth the cost.

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post #8 of 15 Old 04-15-2009, 07:56 AM
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You can adjust the spring preload to set sag but thats about it. Playing with the oil will only take you so far, but yes its a start.
Cheers
I stand corrected, you are right there. Got a bit mixed up. $300 / $500, if you're tight on money with the economy being the way it is, it's not too much of a difference. When you can save half of what you were intending to spend by doing your own work or resolving the issues by spending less, but achieving the changes you wanted. Aside from that, think of the other farkles / upgrades you could put that $150 - $200 towards if the gold valve isn't needed.

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post #9 of 15 Old 04-15-2009, 08:40 AM
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The OP asked about improving the forks by changing springs and enquired about valves. There was no mentioning of the economics.

I maintain the money is very well spent, especially if you do your own work.

At any rate, he now has his options.

Cheers!

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post #10 of 15 Old 04-15-2009, 08:45 AM
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If you are a 150lb Japanese fellow who rides naked and never corners you probably do not need to upgrade your springs. If you are not a naked Japanese, occasionally ride on a curvy road and have a fondness for the gyro you could probably receive significant benefit from a spring upgrade. Go to the Sonic Springs website and they have a chart that will give you a pretty good general idea what spring weight will suit you. For fine tuning e-mail Rich and he will give you the straight poop on the best spring.

A heavier weight fork oil may help some but it if your weight and riding needs exceed your spring's capabilities you have not gained much for your effort. To properly drain the fork oil you have to pull the forks anyway. Why not just replace the springs while you are installing new oil? It is a little more money but no more work.

When I upgraded I used .95 springs and 15wt oil. My immediate goal was to reduce the massive front end dive I had when applying the brakes. New oil and springs and now very little front end dive. I feel a lot safer now. Added a fork brace this year and that completed the suspension trifecta.

I almost forgot: Springs-$80, oil-$6, forkbrace-$85 for a total of $171 US shrinking value dollars.

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Last edited by Scarlett Harlot; 04-15-2009 at 08:47 AM.
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