Aprilia Tuono Rear Shock (Sachs)

Xavez

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I just got around to finally installing my 2014 Tuono V4 Sachs shock. It does not have the length adjusters but I can confirm that it fits on a 2017 LED NC750X, although the reservoir does press on the plastics.

DSC_0520.jpgDSC_0523.jpg

I went with the stock springs and max'd out preload settings but still couldn't get a proper sag setting. Bike was squatting a lot and slower to turn. However, together with the Showa Dual Bending Valves up front, the ride is now so much better than with the stock shocks! No more jarring shocks from rough roads. It also corners and holds a line like it's on rails and this is with the soft springs.

I set the compression and rebound according to recommendations from the forum below as a starting ball park, and it worked pretty well for my 80kg (175 lbs) weight.
Compression 1 ¾ turns from max out
Rebound 20 turns in from max out
Performance Bikes May 2005 issue - Tuono set up guide

I'd be ordering new springs based on the recommendations in the previous posts. Thanks for the info guys.
 

SirBean

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Hello all.

For those contemplating I just wanted to pass on some information on my experience after I completed my install of a APRILIA RSV4 TUONO V4 OEM SACKS ADJUSTABLE REAR SHOCK. Again it was the adjustable version. I just used some long bolts between the top and bottom joints of both the OEM and Aprilla and eyeballed it as best I could. It seemed to work out well. Looking the the shock linkage, there is room and the height adjustability might be useful later on if I want to experiment.

I am about 200 lbs and researching the past threads I chose and was able to get a 1092-49 Ohlins spring from Cogent Dynamics for $90, along with my front fork emulators. They are a great crew there, and props to Todd for working so much with me.

Yes the shock was a tight fit with the reservoir but, as with the many before me, it fits.

My main point that I discovered and wanted to share is the top mount bolt design as seen in the attached pics. Shock mount 1.jpgShock mount 2.jpgShock mount 3.jpg

Basically the head of the top mounting bolt goes THROUGH the mounting flange on the left side squeezes the shock tight against the only the right flange. The head of the bolt is obviously held secure by the collar for the vertical movements, but this essentially means that spacer width for the upper left side of the shock mount is not an issue. Its a small thing but may help those considering going to the details of very specific width spacers. I was able to find washes that were were .2 mm which for me was close enough.

And, with only 15 mile ride so far, with the Cogent dynamic emulators, fork springs, oil, the RSV4 V4 shock with the 1092-49 Ohlins spring, the bike is much better all around. The jolty road cracks are all but gone now. My wrists and back are much happier.
 

Therapy

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The jolty road cracks are all but gone now

This is what made the cost of my RaceTech stuff worth it. Plus the all around better handling and feeling more secure and.......well lots I guess.
Ready for the next Dragon meet.
 

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ted007

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Tuono shock top eye

The new spring came in from KFG. I installed it Saturday and learned a few more things about the swap. I went with the 180mm X 120nm spring and my sag numbers are perfect. The spring leave plenty of adjustment so it should work for heavier riders.


First the springs. The 180 is to the left, 170 in the middle and the stock 160 Tuono spring is the right one.



This is the 170mm X 110nm spring installed and set to my sag (175lbs). You can see where the adjustment rings are set and I wasn't able to achieve proper free sag when the proper rider sag was set.



This is the 180mm X 120nm spring installed and notice now where the adjustment rings are set. This was close to where the rings are after sag was set.



I disassembled the NC's shock to see what I was working with and I was amazed how strong the spring was. I used a large spring compressor at work and it took some effort to compress it.

Comparison of the NC and Tuono.



I compared the two shocks and they are identical in both length and compression. The Tuono's shocks adjustment screw does both rebound and adjustment. Turn the adjustment screw out and compression is very easy and it rebounds almost instantly. Turn the screw all the way in and compression very difficult and rebound is very slow. Set the screw to a little over half way and it's similar to the NC. The screw has 42 positions and my final setting was 30 clicks in.

You can see how the stroke is the same and I did measure it and found them to be almost the same.



This is the Tuono shock installed on the bike with the 170 spring and for comparison the bottom picture is the 180 spring installed with the correct free sag and rider sag. Note the position of the adjustment rings. I set free sag to 5mm and rider sag was set to 38mm. My weight is 175lbs.




There is only one issue with using the shock that hasn't been discussed. The Tuono (Sachs) shock uses a rubber mounted bushing on the bottom and the NC uses a bushing with needle bearings on the bottom. How long will that rubber bushing last used in that position? The Sachs does have a needle bearing arrangement but in the top position when mounted to the NC.
The Touno shock top eye is a spherical bearing. What you see is the beige oil seal.
Pry out the 2 bushings , remove the seals & you'll see the brg.
Should last a long time.
 

sdouble

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maybe the RSV4 shock upgrade deserves its own topic ?
Did someone who did this upgrade (RSV4 shock) with a 180 mm long, 12 k/mm stiffness could sumarize his setting including the preload adjustment ?
 

Xavez

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A 2020 update: ran about 10 000km on the stock springs of the Tuono V4 shock with remote reservoir and finally decided to have it swapped. Here are the photos of the plastic shroud and shock reservoir: IMG_20200126_154710.jpgIMG_20200126_154611.jpg

No issues at all. Ignore the little scrape in the center; it came like that from the seller I got the shock from.

I put in a 6", 700lbs spring and... It's still short on the preload. Feels better than stock springs however. Will be trying a 7", 700lbs spring next. I weigh 176 lbs with luggage and gear.
 

ted007

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I have a 6" 950 lb spring , never used 2-1/4 i.d., 3-3/8 o.d. for $50 + shipping, if you're interested. OR a 7" 950# slightly used for the same price.
 

Dragonjoe

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A 2020 update: ran about 10 000km on the stock springs of the Tuono V4 shock with remote reservoir and finally decided to have it swapped. Here are the photos of the plastic shroud and shock reservoir: View attachment 41619View attachment 41620

No issues at all. Ignore the little scrape in the center; it came like that from the seller I got the shock from.

I put in a 6", 700lbs spring and... It's still short on the preload. Feels better than stock springs however. Will be trying a 7", 700lbs spring next. I weigh 176 lbs with luggage and gear.
I installed same shock with Ohlins 01095-44 spring.. 7 inch, 685 lbs/in. I weigh 170lbs plus gear. it will give you lots of preload threads. Lots of compression to install so not much adjustment Was needed. a few turns and sag was good. Set the dampers mid way and haven’t played around with them. Real good hiway and much improved on rutted dirt.
 

nicecruise

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Just an update to anyone doing this:

I am 180lbs, maybe 185 depending how much beer I drink on a given weekend. I run a Top Box 24/7, though it's not heavily packed or anything.

The stock spring was no where near correct as far as setting sag. I ended up using 3 different springs (thankfully my race sponsor suspension shop was willing to repeatedly send me new springs until I found the correct one). Here's what I found:

Stock Sachs Spring Info
Length: 150mm
Diameter (interior): 57mm
Rate: .97kg

What ended up working for me
Ohlins
Length: 170mm this is important!
Diameter: 57mm
Rate: 115 (115 as its listed on the spring)

Here's why: The standard 150-160mm length spring from Ohlins is simply not long enough to work with our linkages. No matter how stiff you go (105 is stiffest a 160mm spring will go from Ohlins btw), it is simply too short and the travel of the linkage soaks up too much of the shock to begin with. What does that mean? That means you end up using a ton of preload before you even start working the spring. What you end up with is a bike that has too much sag, even though you have free sag (indicating the spring is not too stiff), but you have no more preload adjustment. You can solve this by doing two things: 1) Get a preload spacer or 2) a longer spring. I chose the latter.

So, for you 180lb riders, since I've done the leg work of running a .97kg Ohlins, a 100 a 105 and a 110 (all in 160mm), and finally a 115 in 170mm length -- I highly recommend you skip that process and call your local race shop, tell them you need a 170mm length Ohlins spring for your Tuono shock in a "115" rate. You won't be disappointed. :)
Hi there thanks for doing the hard yards on this? I am pondering why you chose to go new spring rather than a spacer? Did you investigate the spacer at all? Cheaper? Or would it have been less comfortable?
thanks
 
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