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Old March 13th, 2019, 01:00 PM   #1
john pierson
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SHOCKS

Any different alternatives other than GSXR found? I put a SV650 spring on mine only to find it was stiffer. Luckily I have another GSXR unit on hand.
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Old March 13th, 2019, 04:16 PM   #2
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Due to difference in wet kerb-weight, pretty much any shock from any other bike will be stiffer than Ninja 250's. However, that may be good thing if you're on heavy side 70kg+. The GSX-R's shocks are all stiffer than SV650s.
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Old March 13th, 2019, 07:02 PM   #3
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Here's a thread about mounting a GSX-R 600 shock, (and other info lower in the thread) I used one off an '09 which is the stiffest spring of the diff. years (525 lb) and it is none too stiff on my track bikes. I'm about 185 lbs geared up and the bike is around 310 lbs. I'd guess the leverage ratio on the shock links are quite different as the boy's GSX-R 600 seems stiffer sprung than the 250 Ninjas even though it's heavier.
https://www.ninjette.org/forums/showthread.php?t=214238
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Old March 14th, 2019, 10:58 AM   #4
john pierson
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I'm in SHOCK!

I've done a number of shock swaps on different bikes so nothing new. Just curious to see if any new ideas have come up. Regarding the SV spring I mistakenly assumed it was softer. But after feeling it was stiffer I did more thinking. SV & GSXR springs are same length & wire size but SV smaller OD. Visualize them as straight rods instead of coils. The longer piece is easier to twist with a given amount of force therefore a softer coil. The difference must be in the linkage ratios used on each bike. I'll be putting my spare GSXR unit on soon. I get the curb weight issue too as my SV w ZX10 shock is near perfect as those bikes weigh about the same. The 1st GSXR install worked great w modded fork but just a bit stiff for this 1946 body.
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Old April 9th, 2019, 11:25 PM   #5
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Onlins & others make shocks for the Ninja. I have a Ninja 250R one in my ZZR250, which raises the back end as well, so perfect.
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Old April 19th, 2019, 08:48 AM   #6
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oldheimer

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Old April 20th, 2019, 12:10 AM   #7
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research if newgen shock is the same eye to eye as the 300. if yes progressive shock is your answer. works good and its cheap.
https://www.ninjette.org/forums/showthread.php?t=330813
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Old April 20th, 2019, 02:59 AM   #8
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2nd-gen SV650 (2003+) may be good alternative to GSX-R shocks. Might be able to clear dog-bones without spacers.
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Old April 20th, 2019, 06:39 AM   #9
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THANX

Can't afford any new bit. Late SV is interesting-anyone using it? Did100+miler yesterday and was fine on smooth roads. Pavement with repair stripes like our winters create are uncomfortable. Mine came with lowering links so may try dropping one hole to see if that might make a difference.
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Old July 7th, 2019, 04:40 PM   #10
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For those wishing to install GSX-R shocks on Ninjette, there is no need to mangle shock by drilling out its upper bushing or your frame with hasty 1/2" drill bits by hand. The 10mm bolt used for GSX-R shock is fine because it generates sufficient friction to hold bushing in between ears.

To use factory unmolested 12mm mounting ears and 10mm shock eyelet, you just need two sleeves like this. Might need to remove 1mm from width to not extend beyond width of mounting ears on frame.

Polaris # 5135275
https://www.ebay.com/itm/302898035590

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Old January 2nd, 2020, 09:27 PM   #11
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I'm a little late to this party, but I have some relevant info. I swapped a second gen SV650 shock onto my EX500 (pretty similar to the NewGen/300 suspension setup) for a while.



• It has a 430lb/in spring on it, compared to 525 on the NewGen (I understand the 300 to be the same). For comparison, the PreGen is 440 and the EX500 is only 300.

• The SV spring is larger OD, as you can see in the pic above. You'll probably need bowed links and/or spacers for adequate clearance, like the GSXR. All of the these little Ninja springs are smaller OD than "standard" shock springs found on aftermarket shocks and many other bikes.

• The SV shock is longer. The NewGen shock is already a bit longer than the EX500 shock, so I actually drilled a separate hole further up the clevis to match my OEM shock.



• As mentioned, the Suzuki shocks use 10mm mounting bolts while the Kaws use 12mm. I got a 12mm reamer bit and used a drill press to open up the holes. It ended up being a more snug (but still free-moving) fit than the OEM holes. The SV shock uses a threaded clevis rather than the bolt passing through to a separate nut, so there was a bit more material there to go through. The spacers that DannoXYZ mentioned above could replace modding the top eye.

• The SV clevis, like the GSXR clevis, is narrower than the Kaw lower mount. Whereas people file/machine the GSXR clevis wider, the cheap SV clevis can simply be pried open a little wider with some nuts and threaded rod (or some blunt force). In my case, with moving the mounting hole up closer to the top of the clevis, it rubbed on my mount a little bit, rather than moving completely freely. Just make sure that you have sufficient clearance, but it's a lot easier to modify than the more solid clevis on the GSXR shock.

The SV shock is a decent drop-in upgrade on the EX500. It's the right spring rate for a ~180lb rider, the required mods are easy to do in your average garage, and it's dirt cheap. However, it's nothing special. It's your standard budget bike, unserviceable, minimally-adjustable shock. If it didn't have a very desirable spring rate, I would see no reason to use it. If you can do a GSXR shock, that's more adjustable and serviceable for not too much more work.


The PreGen shock/spring will drop right in on the newer Ninjettes, and has a very similar spring rate. It lacks any preload adjustment though, and is a tad bit shorter. You can swap the PreGen spring onto an EX500 shock though. You'll need a spring compressor to get the spring off the PreGen shock, but the EX500's threaded preload adjuster means it comes apart easily (plus it offers more precise preload adjustment). The PreGen spring is a bit shorter, so you may need to add a spacer if you need a lot of preload. The shock seemed to be a little bit shorter than the NewGen/300 too, which may give you a bit of lowering without needing separate links.



I consider the SV and all the Ninjette shocks to be pretty basic with no/limited adjustment. I consider them resprings to get something that matches my weight, not a "shock upgrade" per se. In the end, I used the NewGen shock because it best matched my weight, and had the bonus of requiring no mods and lifting the rear a bit. The SV shock was easy to mod, but did still require several mods to fit properly. The PreGen spring swapped onto the EX500 shock gives the same spring rate, with no mods and pretty minimal work.

The GSXR shock requires more work to mod, and has more fitment issues (with spring size and the canister), but is a better shock all-around. The different years and bike sizes used different spring rates too. Based on my research, the '01-'02 GSXR1000 should have the same spring rate as the SV, if you could use that part (cheap on eBay) instead, or even swap its spring onto the GSXR600 known to work on the Ninjette. The early SV and the GSXR600 commonly recommended both have spring rates similar to the stock shock, so it makes sense that they wouldn't really help you if you're trying to find a softer spring.
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Old April 28th, 2020, 03:29 PM   #12
john pierson
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gsxr 1000?

Thanks for reply that I just discovered. Do you know if that 01/01 spring will fit the later shock? I.D., length etc. I've scrounged all the shock dimension/spring rate info online but haven't found spring physical specs. Broke out of isolation on 250 yesterday as 70 degrees couldn't be ignored. I'll get the 300 out in a few days albeit with mucho seat padding. I'll happily order up another ebay shock if spring will fit.
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