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Discussion Starter #1
Model 2014 CTX700D DCT
Bought used in the fall with ~8k miles
Rider weight with really really heavy gear, > 250 (my gear is really heavy)

Coming from a Majesty (400cc scooter), I was hoping for significantly improved suspension over the scooter style CVT mounted on the swing arm. As I quickly experienced, the suspension was way too soft, and even cranking preload to the max didn't change the harsh ride. I was considering the Gonzo mod, and luckily picked up what looked like almost a brand new 2016 shock, with linkage for about $60 on ebay. One thing I noticed right away was that the new shock had more threading, which would allow more preload out of the box.

But more reading on the topic slowly dissuaded me from this approach. I came to the conclusion that I would need a different spring, at the least. Much better mechanics than myself were able to change the spring, but it would require some fabrication that was well out of my abilities.

I looked around and found the penske and ohlins options, which were still out of my price range. But extending the search to overseas vendors and including shocks designed for the NC700S, dramatically increased available choices, including Mupo, Hyperpro, Hagon and YSS. The cheapest option was YSS. One thing that gave me some comfort with the YSS is that it is well documented online. This made it relatively easy to find all the models and specs and opened up some more choices. More importantly, I knew what kind of spring it would come with and it was pretty simple to buy drop in replacements with all sorts of different rates. Someone with more experience would know which spring they could drop in as a replacement and where to get them.

The shock itself was compression rebound and height adjustable out of the box. The height adjustment was important and allowed me to settle on the model that was designed for the NC750X which I could shorten by 5mm to 300mm at the shortest. That's less than 5mm longer than stock, which I figured wouldn't result in too high a seat heigh, or require a new kick stand. I found the YSS for $275 plus about $50 in shipping. That was an investment I was comfortable with.

I think I got this next part right. But here's the data I collected. The YSS springs are spec'd in N/mm and this shock came with a 150 n/mm spring. That translates to 856 lb/in. According to RaceTech, the OEM spring on the CTX are 18.98 kg/mm. That translates to 1063 lb/in. Since my "gear" is so heavy, I guesstimated I'd need a much heavier spring. I found another YSS spring with the same length and width with a 265 N/mm. According the online calc I found, that spring was approximately 1400 lb/in. That seemed right to me.

Now changing the spring seemed like it was potentially one of the more challenging aspects of the job. I won't delve into all the detail of attempting to use a spring compressor I found on amazon, or the ratchet method I had seen on some Youtube videos. What I realized after some trial and error was that all I needed to do was back off the preload until the spring cap came loose on its own. That's kind of big deal with regards to the design of the shock, and I'm a little surprised that its not marketed a little more clearly. Basically, you don't need anything special to change the spring, just unscrew the preload until the cap slides off.

Another selling point of the YSS is that the preload is adjusted with a better mechanism that the two nuts requiring a spanner. There's one nut, and you can insert the 8mm steel bar directly into the nut to tighten. It's much much easier than the pair of nuts that need to be whacked with a screwdriver.

Anyway, the result is that my static sag is approx 17mm, and my rider sag is about 37mm right now.

Next up are the forks.
 

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Someone else went with a custom Penske but if your serious about keeping this bike I highly recommend changing the rear shock out, your spine will thank you and so will your pillion.
 

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Discussion Starter #4
Pictures

Apologies. I should have take some side by side photos but I get tunnel vision when I start working on things.

Something I forgot to mention about the YSS shock is that the free travel of the piston, before it hits the bushing is about 46mm. On the stock shock, I measured 28mm.

Some other numbers. I measure about 16mm of preload threads on the '14 shock while the '16 had about 19mm.
 

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Josh..... i’m Coming back for a long term review around August..... I’m really interested in this......
 

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Discussion Starter #7
Josh?
Could you post part nos.?
Thanks.
I ended up installing the MZ456-305TRL-34.

It's a drop in replacement except that its a little taller than the stock. This shock is adjustable between 300-310 mm. The stock is measured at 296-297 mm. The spring is rated at 150 N/mm.

After purchasing, I found this on the YSS site: MZ456-300TRL-48

It is height adjustable between 295-305mm and it comes with a 200 N/mm spring instead of the 150. But I didn't find a supplier for this model.
 

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Did these shocks improve your ride on the bike?

Would you purchase the ones that you ended up buying again?

If not, is there one that you would think to use now?
 

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Thank you Josh for the rear suspension post / idea back in February. Back in mid-May, I ordered the YSS MZ 456-300 TRL-48 myself. Finally got it in from UPS today.

Anyways, I figure I post a couple pictures of the shock out of the box so if someone is also interested they have close ups of the top / bottom of the shock assembly and adjustments.
 

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Thank you Josh for the rear suspension post / idea back in February. Back in mid-May, I ordered the YSS MZ 456-300 TRL-48 myself. Finally got it in from UPS today.

Anyways, I figure I post a couple pictures of the shock out of the box so if someone is also interested they have close ups of the top / bottom of the shock assembly and adjustments.
What supplier were you able to source this one from? Im having a heck of time finding this model.
 

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What supplier were you able to source this one from? Im having a heck of time finding this model.
I used EPM Performance Imports, Inc. for the YSS shock. They also sell a variety of aftermarket motorcycle suspension parts from Wilbers, Gazi, Hyperpro. Klaus and the rest of their team were helpful. There shop is located in Manalapan, NJ outside the NYC metro. ( YSS Motorcycle and Scooter Shock Absorbers - EPM Performance Imports ).

In my research I also found Googling a 2nd shop called Ted Porter's BeemerShop. He's out of Scotts Valley, CA which is between San Jose and Santa Cruz, CA. ( https://www.beemershop.com/Ted_Porters_BeemerShop_Motorcycle_Suspension_Specialists_All_Brands_Sales_Service_Installation.html ).

I went with EPM largely as they are located about 20 minutes from a family members house. I will install as a DIYer, but I figure if needed I at least could swing by their shop for an visual inspection, etc.
 

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Can any of you who have installed these aftermarket shock units on your bike let us know how you feel about the ride/handling now? Thank you.
 

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Can any of you who have installed these aftermarket shock units on your bike let us know how you feel about the ride/handling now? Thank you.
I did the aftermarket NC750x swap on my trike and if it fell off, I'd do it again. :)
 

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Can any of you who have installed these aftermarket shock units on your bike let us know how you feel about the ride/handling now? Thank you.
The most obvious difference was that the rubber suspension effect of the OEM shock disappeared. Earlier I raised my buttocks on every bigger bumps. Ohlins with linear coil and more stroke feels more civilized.
.
 

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Hi Maurimy! hardest spring, 210! adjustable in compression, extension and wheelbase, hydraulic spring preload which I highly recommend! comfort and stability changes from night to day! seems to drive another bike! my back never tires! if you sent the wilbers behind and received the money, think about this!
 

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Hi Maurimy! hardest spring, 210! adjustable in compression, extension and wheelbase, hydraulic spring preload which I highly recommend! comfort and stability changes from night to day! seems to drive another bike! my back never tires! if you sent the wilbers behind and received the money, think about this!
Sounds like you have all pieces to enjoy of your ride in future. I hope I also could have hydraulic preload adjustment. I bought Ohlins after returning Wilbers, look at my post here. I had a bit different ideology behind (probably), because I seldom carry with me much luggages, so I preferred stroke and higher seat height instead of carrying capacity. I don't understand how it is possible that Honda failed to design reasonable suspension ending up to something like this OEM suspension. Probably after making too many compromises. I hated the way it took bumps. Your shock absorber was one of those I had in my mind, two Italian, one German and one Swedish shocks. I didn't find US shocks on European markets.
 

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my bike has risen about 10mm more how it was before with maximum preload ! Now it is very inclined on the side stand and it's ready to make long journey with so much weight without any problema! I also put the new michelin road 5 tires!
 
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