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Discussion Starter #1
Hi all,
My bike (06 Z750s) has a rusty and generally terrible looking rear shock. It rides fine but I've read a lot about how the 03-04 ZX6R shock can basically drop in for a bit of extra performance. Now I can find those all over eBay for $40ish but they're kind of a gamble at 12 years old now, there's no way to know if they shock is still working properly before purchase.

However I did more reading and found out that the 05-12 shocks will fit into an 04 ZX6R; this means they should also fit into a Z750s. On eBay I can get a like new 13-15 shock for $100.

So my question is, does anyone know if the 13-15 ZX6R shock will fit into our bikes? Thanks for any input.
 

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Some of the people in here have had problems with the shock reservoir hitting the frame cross member directly above it under compression, with newer shocks. I took a chance on a 2010 ZX6r rear shock and linkage and mine clears but not by much. With no weight on the suspension I can just fit a finger in between (reservoir/cross member) sitting on the ground you can't anymore, I don't have any marks on the shock or frame from contact but I think its pretty close as it is. You'll have to turn the regulator 180 degrees so it plugs in at the back to make some clearance for the regulator plug but mine went in pretty easily and improved the ride quite a bit, actually didn't feel like the same bike although I did the front with BPFs at the same time so I would have been disappointed if it hadn't. In my opinion the best thing you can do to these bikes is suspension upgrades, the stock rear just can't keep up when pushing it (not enough damping), making the rear feel loose and the front dives a lot under braking unloading the rear making late braking corner entries a bit of an experience because of minimal rear traction. I lost the rear on mine in just such a situation and ended up in a ditch, since upgrading my shock/forks/brakes I've gone around that corner at higher speeds than the day I ran out of road on it and stayed between the ditches. I don't think anyone has tried anything as new as 2015 as far as I know but they may or may not fit. How much of a gambler are you? My 2010 shock wasn't supposed to fit and did, if you take a chance and it doesn't you could always resell it.
 

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Discussion Starter #3
Thanks for the info. I might just fit an 03-04 shock to it because they're so cheap. If the shop is busted out then I can try a newer one.

I live in Mass (pothole central) so I feel that a close fit might not be enough.
 

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Thanks for the info. I might just fit an 03-04 shock to it because they're so cheap. If the shop is busted out then I can try a newer one.

I live in Mass (pothole central) so I feel that a close fit might not be enough.
https://vk.com/video204374783_170848138

The 03-04 shock doesn't smoke pot. That's why the ZX6R doesn't like bumpy roads neither does your Z750 when installed (you may have found out meanwhile). Anyway - I thought I would post some pics showing the fit on a Z750S. No modification necessary, no grinding (as mentioned somewhere). This mod is plug and ride.

P1010314.JPG P1010319.JPG P1010316.JPG

The rear comes higher (approx. 2 cm) for some reason even though the shock is said to have the same length as the stock shock. You can keep the stock kick stand though even with spacers in the fork (here 2x 11 mm). You may want to read the Z750S front end dive thread.
 

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PICT0021.JPG PICT0022.JPG

My 2010 zx6r installed, could have gotten better angles for the clearances I guess but it works better than the stocker did.
 

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More ground clearance wasn't my intention but a welcome side effect - sure enough this mod has turned out to be boot friendly.
 

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As long as the shock never bottoms out should be fine since it's not supposed to move I just like the thought of more room is easier to clean
 

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It does move as the suspension compresses it pivots on the upper mount the reservoir tilts upward towards that bar above and ahead of it, and the bottom of the shock moves slightly backwards it is probably about as close as possible and still work, under full extension I can fit my index finger in between with the bikes weight on it I can't anymore, full compression would be hard to check, but like I said no marks from contact on either the crossbar or my reservoir. I've actually been looking at a Wilbers stage 3 shock with remote reservoir going for just under $900 Can. on ebay, that can wait until I finish the engine upgrade though got 3000 mile head and tbs, 8000 mile pistons cylinders just need gaskets, zx9 springs, full exhaust and auto tune module now.
 

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What's up with the "not" bit? Are they no good or something? There's an ebay listing right now for $891 Canadian dollars, free shipping from France the add is in French but I have a French brother in law if I need to read instructions or something. I've been eyeing that shock for awhile seems like a bargain, high/low speed compression, rebound, remote preload can be gotten for a extra price I don't remember how much. I did actually google Wilbers shocks once about a year ago and there is a U.S. distributer as well, I think the prices were similar then. I was under the impression that Wilbers Performance (WP) was pretty good stuff.

Amortisseur Wilbers Stage 3 Kawasaki Z 750 /Z 750 S ZR 750 J /ZR 750 K An 04-06 | eBay
 

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Discussion Starter #14
Apologies for kinda falling off the face of the earth, my bike was out of sight so kinda out of mind.

I just ordered this A07 2009 09-12 Kawasaki Ninja ZX6R Rear Shock Coil Suspension Linkage Dogbone | eBay, a 09-12 Zx6r shock with the dogbone attached. I read that switching the dogbone will prevent the rear height from rising, this was for the 03-04 so I guess we'll see with this one.

As for turning the regulator, what exactly does this mean? I know very little about shocks. Is it literally just unbolting the thing, rotating it, and rebolting? Or more complex?

After this, probably gonna powder coat the swingarm and clean up the rust on my bike.
 

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Yes it is just a matter of unbolting it and spinning it 180 degrees in it's bracket, the hardest part of the whole job is rerouting the wire, but it can be done, take the battery out and it can be squeezed though the gap between plastic rear under tray and the one in front of it with some prying, taking out a plastic rivet or 2 may help with this. I compared my zx6 dog bones and the originals side by side they're the same length but aluminum that's really the only reason to use them instead of the steel originals, the rocker seems like the same angles/center to center lengths as well so any height difference has to be shock length sadly I didn't measure that dduuuhhh. You do lose a little weight doing this but I don't think its that significant unless you're one of those people that count ounces, aluminum bodied shock with reservoir and lighter dog bones vs steel bodied without reservoir and steel dog bones.
 

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Discussion Starter #16 (Edited)
Awesome thanks for all the help! Rerouting a wire or two is no problem for me.

As for the dogbones, I kinda figured that it wouldn't make a difference but it was only a couple bucks more for this shock. This shock is also clean so it'll look nice after a polish.

I'll update when I get it installed. Can't decide if I should do this before powdercoating the swingarm or doing it all in one go.

Also, it took me til now to realize you were talking about the regulator/rectifier, not sure what I was thinking before. :rolleyes:

Rotating or even relocating the r/r shouldn't be difficult.
 

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Discussion Starter #17
Got the shock installed. Has probably a half to a quarter of a millimeter of clearance between it and the cross member. There was some little metal pin sticking out of the member that I didn't remove, it's hitting the shock a bit but it shouldn't be a problem.

Installation was easy, the hardest part was getting the bike up to work on. Ended up using a rope and a $30,000 piece of machinery.

The bike sits a bit higher, is way firmer, and doesn't hit the member even when bouncing.

Thanks for all the help. Next step is the 636 front end, but that's gonna take a lot more work, money and time.
 

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Wow that's close I love my zx14 shock easy to adjust for added passenger weight and fits like stock maybe 2 inches between it and the cross member. Don't know why no one else has tried it yet. The zx6 front end really isn't that bad to do especially if you know any machinist or live close to a technical school
 
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