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Old 10-08-2019, 10:26 AM   #1
thedrewski86
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zx6r shock setup on Gen 2

All,
I installed a zx6r shock on my 2007 sv650s over a year ago and I am really questioning my choice and whether or not my setup is close to correct. Here is where I'm at:
front forks: .90kg/mm Sonic Springs, preload is 2 1/2 graduations out
rear: '09 zx6r shock (ebay), compression and rebound are in the middle, I have backed the preload all the way out because I feel like the bike it trying to buck me off on the really bumpy stuff if I'm riding fast. It's not terrible but I suspect it could be better.
tires: all stock sizes (120/60/17, 160/60/17) Pirelli Angels fwiw. I had a 70 profile on the front but now I like the 60 after going back to it. I'm open to trying different setups though.

I see people changing the amount of fork visible above the triple clamp... I just have the caps visible (no fork tube). I also see differing opinions as to the rear shock length. Looks like the '09 is 339mm. Is this acceptable for a Gen 2?

No track days yet but I would like to. I really want to take my bike up to RaceTech if I can't get this figured out in my own garage. I probably will regardless but I would like to get this as sorted as I can with the equipment I have. I keep watching Dave Moss' videos and I'm trying to get this nailed down but I'd like some advise from the SV crowd. You all have been down this road before!

My specs: I'm currently about 166lbs. I was 200 when I installed all the parts though so it's been changing. My leathers are pretty heavy so I'm probably close to 180 with that, boots, helmet etc.
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Last edited by thedrewski86; 10-08-2019 at 10:50 AM.
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Old 10-08-2019, 12:24 PM   #2
Skywalker67
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Re: zx6r shock setup on Gen 2

Quote:
Originally Posted by thedrewski86 View Post
rear: '09 zx6r shock (ebay), compression and rebound are in the middle, I have backed the preload all the way out because I feel like the bike it trying to buck me off on the really bumpy stuff if I'm riding fast. It's not terrible but I suspect it could be better.
Not sure if this your case or not but most people who find the bike too hard or stiff on road bumps are setting their rebound with too much damping, and try to compensate this with little to zero preload.

Have you tried to set the preload to get the correct rider sag and setting the rebound near to full open?
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Old 10-08-2019, 02:31 PM   #3
thedrewski86
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Re: zx6r shock setup on Gen 2

I have not set the rebound to nearly open, no. I will definitely try that. It's just in the middle now. I set the preload for sag because I thought that was a good place to start but you may be right on the rebound, thanks!
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Old 10-08-2019, 03:09 PM   #4
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Re: zx6r shock setup on Gen 2

start by setting sag. if you cant get the right sag numbers out of the bike, everything else is not going to help. since you havent posted sag numbers, I'm betting you're way off.
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Old 10-08-2019, 03:21 PM   #5
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Re: zx6r shock setup on Gen 2

Well that's kinda my issue. I started with this video and Dave Moss' video on sag when I originally set this up. After feeling as though the bike wanted to buck me I started second guessing my rear shock choice (length and weight of the spring). That's when I started backing out my preload on the back to see if it helped. It seems to have helped some but Skywalker's comment has me thinking rebound, but my weight has changed a lot too. I'll have to re-check my numbers now.
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Old 10-09-2019, 12:51 AM   #6
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Re: zx6r shock setup on Gen 2

I concur with mad8vskillz: first of all you need to correctly set your preload for your actual weight.
More race or touring oriented your choice, but that's the starting point from which fine tuning of compression and rebound shall start, based on your feeling with the bike.

And, after setting the correct SAG, if you feel the bike is going to throw you off the saddle on road bumps, I'd start with an almost open compression and rebound, and then slightly increasing from there on trial-and-error basis.

Edit: I'm not completely sure about the rear shock lenght you quoted in your opening post. I was under the impression it should have been 335mm for a gen. 2 SV, but I might be wrong on this.
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Last edited by Skywalker67; 10-09-2019 at 03:19 AM.
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Old 10-11-2019, 02:55 AM   #7
DarkHorseSV650
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Yup, preload for sag first, both ends.

Shock length is slightly longer than the stock 330mm, but that's not necessarily a bad thing, depending on how you want the bike to behave.

The bike 'bucking' over bumps sounds like too much damping - comp, rebound or both.

I wouldn't start dropping the front until you've set it up as is, then feel like you want it to turn even faster - you've already raised the rear with the longer shock. If you do that you then have to start from scratch with preloading for sag at both ends again.
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Old 10-11-2019, 09:03 AM   #8
thedrewski86
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Re: zx6r shock setup on Gen 2

Well I checked my numbers again. Front is the same as I wasn't messing with it (it's in that 30-40mm range, about 35). I had set the rear to 35mm as well but it's more like 40 now after I backed it out. I think I need to get that back to 35mm and start adjusting my compression and rebound damping.

I really just wanted to check with everyone here as far as if the shock I put on was close enough to really "working" length-wise. It sounds like short of a Penske I'm not too far off the mark. Also I should clarify that the roads I ride involve some pretty gnarly bumps/potholes/washouts etc. so I may be asking a bit much of the suspension. It has occurred to me that an XR650 may be better for this route at times

and DarkHorse, yeah I agree on not dropping the front forks. I think I had seen that mentioned when people went to a 70 profile front which I've already done and I didn't care for it. I'm back to a 60 and prefer it. I only brought it up in case I was leaving any stones unturned.

At this point I'm just going to enjoy it and take it up to RaceTech when it's convenient.
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Old 10-11-2019, 09:57 AM   #9
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Re: zx6r shock setup on Gen 2

IMO your geometry is better with a 70 profile front and the rear raised enough to get rake/trail where you want it. the profile on the 70 is better for handling.

if ride height is an issue due to leg length, that's a different story
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Old 10-11-2019, 10:24 AM   #10
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Re: zx6r shock setup on Gen 2

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Originally Posted by Junkie View Post
IMO your geometry is better with a 70 profile front and the rear raised enough to get rake/trail where you want it. the profile on the 70 is better for handling.
That right there is why I went with the 70 in the first place. I figured it would even out the taller rear shock. While I'm sure it did, I found that I didn't care for the 70 profile when I was doing my parking lot practice sessions (figure 8s, tight weaves, u turns in the box etc.) When I went back to the 60 the bike seemed to "work" again. While the 70 handled better on the highway at 80mph I found it handled worse in the parking lot at 8mph. Since I quit commuting with this bike I'm more interested in the latter.

That's my long winded way of agreeing with your point!
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