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Ok, so I missed one little thing about the GSXR shock......the N400 shock lower is eyelet based.

See attached images, left is N400, right is GSXR.


And the GSXR has the claw style that goes on the dog bone eyelet, there might be a way to get it to work properly, like a collared piece or something in the middle....


Dang, it was worth a shot...........back to the drawing board.

I did measure, on the bike the width of the lower and upper shock mount points, on the bike so I did the best I could with digital caliper.

Upper is 25.81-26mm
Lower is 31.28mm
 

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... maybe SDM! can measure the width of the mounts for us if he still has his around :)
I've just run the vernier calipers over the shock mount points on the bike. ie. the width of the openings.

Top = 30mm
Bottom = 40mm
Length of shock with rear end completely unloaded = 320mm

I think a shock of length 325mm would be fine and sharpen up the turn in a bit.
 

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I think the Ohlins website lists as 320 mm +- 6. Most US Ohlins dealers are out of stock right now, Euro dealers are around $700 USD for the shock, may have to just pull the trigger for the Ohlins, not sure the Penske adjustability is worth the extra $500. . .
 

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Discussion Starter · #25 ·
I've just run the vernier calipers over the shock mount points on the bike. ie. the width of the openings.

Top = 30mm
Bottom = 40mm
Length of shock with rear end completely unloaded = 320mm

I think a shock of length 325mm would be fine and sharpen up the turn in a bit.
Is that for the stock shock?

Just sucked it up and pulled the trigger on the KA744, Ohlins USA supposedly just got a few in stock. . .
Me too. Just ordered the Ohlins from Spears, along with a few other bits. Going with the Traxxion Dynamics AR25 for the front end.
 

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Is that for the stock shock?



Me too. Just ordered the Ohlins from Spears, along with a few other bits. Going with the Traxxion Dynamics AR25 for the front end.
Yeah mine was too, the width between the mounting points on the bike, upper and lower where the bolt goes through the eyelet for the shock.

According to what I have read 320mm is eye to eye on these stock shocks.

The only problem with the GSXR shock is the lower mount is like a claw where it goes around the dog bone, or lower pivot arm where these N400's are the other way around.

So I would either have to fabricate something, or swap out the dog bone/lower suspension arm, control arm...whatever it is called that escapes my mind at this time.
Which would either be a massive undertaking or change geometry.........which I prefer to avoid as the teams of engineers are way better at math and physics than I am :nerd:
 

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RaceTech is currently using my bike for R&D. Probably be a month or so before anything is on their website though. I haven't seen anything about other bikes shocks fitting into the 400. Measurements would need to be taken.
So what’s the latest from Race Tech?...
 

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Discussion Starter · #29 ·
Got my Ohlins shock in! Super easy to swap. Probably the easiest bike I've ever swapped a shock on to be honest. The disappointing part is that I'm pretty sure it came with the wrong spring. It came with the 105 spring, which I think is the default spring for that shock. Feels pretty soft when I sat on the bike. I told Spears (who I got it from) that I'd probably need a stiffer spring than what comes stock on it since I'm a heavier guy and told him I'd need the shock sprung for 230 lbs. I'll have to see what the sag is when I get a chance to measure it, but it definitely feels like it's sagging more than my R3.
 

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So what’s the latest from Race Tech?...
I will have my bike back before the end of next week. They don't have replacement front cartridges. So the front is being revalved with their gold emulators and respringed. The rear is their custom fully adjustable remote reservoir. I am going to the track on the 21st, so I will be uploading lots of video/pictures in the coming weeks. I'll probably only have saturday to install my yoshimura rearset brackets, spears racing detent spring, spears racing radiator cap, spears racing lever guards, and install the rear seat cowl. As well as do all the track prep. Next weekend is going to be busy...
 

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Got my Ohlins shock in! Super easy to swap. Probably the easiest bike I've ever swapped a shock on to be honest. The disappointing part is that I'm pretty sure it came with the wrong spring. It came with the 105 spring, which I think is the default spring for that shock. Feels pretty soft when I sat on the bike. I told Spears (who I got it from) that I'd probably need a stiffer spring than what comes stock on it since I'm a heavier guy and told him I'd need the shock sprung for 230 lbs. I'll have to see what the sag is when I get a chance to measure it, but it definitely feels like it's sagging more than my R3.
Interesting, I might call them up and talk with them or contact them. Cause according to the charts I found the 105 is 10.7 so 600 in lbs.
 

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Discussion Starter · #32 ·
Interesting, I might call them up and talk with them or contact them. Cause according to the charts I found the 105 is 10.7 so 600 in lbs.

Ok...and? lol You just gave a couple of other units of measure for the spring (kg/mm and lbs/in). It's all correct, but I'm not getting your point.
 

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Ok...and? lol You just gave a couple of other units of measure for the spring (kg/mm and lbs/in). It's all correct, but I'm not getting your point.
Sorry, I was just saying, that should be a very stiff spring and rate within your weight even with gear, according to my info.... 105 should be for someone over 225 lbs. ish.... with this bikes geometry, maybe they got the calculations wrong.

Each bike can be different with how that is calculated and require a lower spring rate vs another to achieve the same results.

So for it to be soft, or feel soft I would call them, or however you can contact them, and find out for sure if they gave you the right spring.
If they did, then I guess check your sag, and if correct, then that spring is right. But too soft for that shock for how you like it???

Go up to one that works for you. Don't know to be honest.....you shared the info saying the shock felt to soft, so I guess it bothers you enough to wonder why or want to discuss our thoughts around it, or here with everyone, or considering on what you should do to be happy about it. :angel:
 

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Discussion Starter · #34 ·
Sorry, I was just saying, that should be a very stiff spring and rate within your weight even with gear, according to my info.... 105 should be for someone over 225 lbs. ish.... with this bikes geometry, maybe they got the calculations wrong.

Each bike can be different with how that is calculated and require a lower spring rate vs another to achieve the same results.

So for it to be soft, or feel soft I would call them, or however you can contact them, and find out for sure if they gave you the right spring.
If they did, then I guess check your sag, and if correct, then that spring is right. But too soft for that shock for how you like it???

Go up to one that works for you. Don't know to be honest.....you shared the info saying the shock felt to soft, so I guess it bothers you enough to wonder why or want to discuss our thoughts around it, or here with everyone, or considering on what you should do to be happy about it. :angel:

Usually shocks don't come with default springs for heavier people. Typically they come in sprung for someone that's around 170-180 lbs. I know for sure that the Ohlins shock for the R3 was great for someone that was 150 lbs or less, so pretty far off for someone heavier like me. On my old Ducati 1198, the Ohlins shock I had on that came standard with an 80 N/mm spring, but I needed a 100 for my weight! I don't want to pass judgement so quick, since I haven't even ridden it yet or measured the sag. I will do that tomorrow finally, so I'm pretty excited to try it out. Maybe it'll feel fine, but that was just my first impression when sitting on it and noticed how much more it sagged compared to the R3.



My Traxxion Dynamics AR25 inserts were delayed because UPS had a bunch of delivery delays due to Hurricane Michael. Was supposed to arrive yesterday, now it says Monday. So I'll be riding on stock forks tomorrow, but should be ok. Just a test to get the feel for the bike. Don't plan on pushing it too hard.
 

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Discussion Starter · #35 ·
Well needless to say, I forgot to measure the sag yesterday lol...had a lot of other things to deal with, and completely forgot. But I did feel like the rear end was sagging a bit more than I'm used to when getting on the gas coming out of turns causing the bike to go wide a bit. Wasn't terrible, but it could be improved a bit. I think for now I'll just add some more preload and try to remember to measure the sag this weekend.
 

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Usually shocks don't come with default springs for heavier people. Typically they come in sprung for someone that's around 170-180 lbs. I know for sure that the Ohlins shock for the R3 was great for someone that was 150 lbs or less, so pretty far off for someone heavier like me. On my old Ducati 1198, the Ohlins shock I had on that came standard with an 80 N/mm spring, but I needed a 100 for my weight! I don't want to pass judgement so quick, since I haven't even ridden it yet or measured the sag. I will do that tomorrow finally, so I'm pretty excited to try it out. Maybe it'll feel fine, but that was just my first impression when sitting on it and noticed how much more it sagged compared to the R3.

My Traxxion Dynamics AR25 inserts were delayed because UPS had a bunch of delivery delays due to Hurricane Michael. Was supposed to arrive yesterday, now it says Monday. So I'll be riding on stock forks tomorrow, but should be ok. Just a test to get the feel for the bike. Don't plan on pushing it too hard.

I gotcha, so you think this is the default spring included with that shock, that makes sense now....

According to the KA 744 model shock, the 105 is default.
https://www.ohlins.com/product-item/62901/

Here is the manual for the KA 744 (STX 36)
https://www.ohlins.com/app/uploads/world/2018/08/MI_KA744_EN_0.pdf

The one Spears sales is the appears to be the same one, but I am not sure. If so then yes that is a default and according to the manual there is a 110 and 115 (unknown what the weights are for those springs based on the geometry for this bike)

I could not find a chart for that shock on the N400, but everything else showed the 105 sprung for a rider over 200 lbs
I called two local suspension places, they used to be and one shut down early this year and the other moved out of the local dealer (Sloans) like 2 years ago, lol shows how long I have been outta the game

I know when you order a Ohlins shock you can get it sprung for your weight, and the dealer would order it with the one you need, or swap it out, or they should, typically that is an included service/option...I would contact Spears and discuss it with them, call me old fashion, I prefer a phone convo for stuff like that:grin:
 

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Discussion Starter · #38 ·
I gotcha, so you think this is the default spring included with that shock, that makes sense now....

According to the KA 744 model shock, the 105 is default.
https://www.ohlins.com/product-item/62901/

Here is the manual for the KA 744 (STX 36)
https://www.ohlins.com/app/uploads/world/2018/08/MI_KA744_EN_0.pdf

The one Spears sales is the appears to be the same one, but I am not sure. If so then yes that is a default and according to the manual there is a 110 and 115 (unknown what the weights are for those springs based on the geometry for this bike)

I could not find a chart for that shock on the N400, but everything else showed the 105 sprung for a rider over 200 lbs
I called two local suspension places, they used to be and one shut down early this year and the other moved out of the local dealer (Sloans) like 2 years ago, lol shows how long I have been outta the game

I know when you order a Ohlins shock you can get it sprung for your weight, and the dealer would order it with the one you need, or swap it out, or they should, typically that is an included service/option...I would contact Spears and discuss it with them, call me old fashion, I prefer a phone convo for stuff like that:grin:
Where did you find that chart that shows the 105 is for over 200 lb riders? I will say that on my ZX6R, I had an Ohlins TTX shock that had a 110 spring on which was too stiff, then switched to a 100 and had to put a lot of preload on it, so the 105 would've been perfect for me. But of course that's a different shock and different bike, so you can't really compare it like that.
 

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Where did you find that chart that shows the 105 is for over 200 lb riders? I will say that on my ZX6R, I had an Ohlins TTX shock that had a 110 spring on which was too stiff, then switched to a 100 and had to put a lot of preload on it, so the 105 would've been perfect for me. But of course that's a different shock and different bike, so you can't really compare it like that.

There are charts all over the place for ZX6, RSV, VTR, but I could not find one for the 400..yet.

Now I did find a place in Boston and was using there info, check out there site....

Ohlins STX36 Shocks for Kawasaki EX 400 (18-Cur) | KA-744 | Motorcycle Suspension Specialists | ComputrackBoston.com

Notice they say the default spring is for 220 at the highest end, and it shows the default "is" the 105.

Spring Note: The default selected spring rates assume rider weight 170-220 without gear.

So I would say the 110 nm is 220-275 lb rider???
 
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