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Discussion Starter #21
-2mm of preload is +4mm of free sag on 95N/mm. So it is hould be atleast 3mm less preload for me, i will shot at 5 mms of preload with this spring, if that is less than i need i have +10 mm of preload to add from knob adjuster. That should be plenty to add to fix R1-R2 at 10 mms for me, and to add wife and have some bit of static. Wife is 57kg.
I follow old school philosopy, like from RaceTech or Max McAlister for example
i recomend to everyone to watch this.
 

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10mm installed preload is about right. I don't know what you mean by getting 10mm static sag with the adjuster full in. Does that mean no extra preload? If so, thats fine. Just add preload when your wife comes along.
 

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Discussion Starter #23
10mm installed preload is about right. I don't know what you mean by getting 10mm static sag with the adjuster full in. Does that mean no extra preload? If so, thats fine. Just add preload when your wife comes along.
Sorry for misunderstanding.
Total spring lenght is 170mm.
Minimal preload i can get is 10mm. With spring adjuster all the way up on top of the shock it preloads shock spring to 160mm.
I can get more preload with dialing in knob preload adjuster, up to 10mms. If i dial that all the way in spring preload is 20mm, and spring lenght is 150mm then.

Now im considering maybe putting spring that is 165mm (didnt find them). Only thing i can find is 160mm, and im not shure how would that work.
With shorter spring i could add and substract as much preload as i need o get optimum result.

Now i have 1150N of force preloaded in this spring(115N/mm x 10mm), and i have 0 statick and shock travel is reduced 10mm. My spring is reduced 10mms (160mm)

Bill64 has 12mm of preload for 95N/mm and that is 1140N of preloaded force and he claims he has 7mm of static. His spring is reduced 12mms (158 mm)

That is 1kg less, or like 2.2 lbs. I dont understand it. I have MSc in engineering, and i just dont understand.
 

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Maybe I'm thick or there's communication problems. Your shock travel is not reduced in actual practice, you will never bottom it out. You must have installed preload or the spring will be loose at full extension.
So 10mm preload is a given. A shorter spring will reduce shock travel because it will still need installed preload. Your ride height will be too low.
Where did you buy the shock from? Ohlins direct? If the spring retainer is incorrect they should fix that.
Could you compare your fully extended ride height as in this photo? The silver pointer is a screw driver in the front hole of the number plate mount and the bottom is the top edge of the chain adjuster track.
My bike is 515mm.
 

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Discussion Starter #25
You are totaly correct, kid was jumping all over me when i was writing. Shock travel is not reduced. Spring is reduced. Now is allmost 10PM here. Tomorrow i can show you the video of how i dont have free sag, and i can take pictures. I bought shock from local Yamaha dealer, who bought it from his friend from Italy or Austria (Shop)...dont remember... I can find damn clips for 10-20 Euros, but for TTX, not for STX. I dont get answer from local Ohlins in a week. Today i contacted main Ohlins.
Please find another reference for measurement, i have MK2. I will gladly compare my ride hight.
I realy like the shock, rebound damping is great, compression damping is great, preaload adjuster is great. But i dont know, maybe spring is more than 115N/mm, maybe it is to long. But im not stupid, R1-R2 is 0. And with this assembly i cant get it to 10mm.
Ty for trying to help.
 

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You are totaly correct, kid was jumping all over me when i was writing. Shock travel is not reduced. Spring is reduced. Now is allmost 10PM here. Tomorrow i can show you the video of how i dont have free sag, and i can take pictures. I bought shock from local Yamaha dealer, who bought it from his friend from Italy or Austria (Shop)...dont remember... I can find damn clips for 10-20 Euros, but for TTX, not for STX. I dont get answer from local Ohlins in a week. Today i contacted main Ohlins.
Please find another reference for measurement, i have MK2. I will gladly compare my ride hight.
I realy like the shock, rebound damping is great, compression damping is great, preaload adjuster is great. But i dont know, maybe spring is more than 115N/mm, maybe it is to long. But im not stupid, R1-R2 is 0. And with this assembly i cant get it to 10mm.
Ty for trying to help.
Hi, i also have this problem... I bought the SP version of the MT-09, which comes with this shock preinstalled, and I tried to setup suspension the same way as you and I also have 0 static sag with all preload out...

I found some suapension tehnician and can't wait to go and see what he has to say, because I have another problem - My weight is 69kg with full gear and rear spring is to hard for me.
 

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For what it’s worth I ordered racetech front springs and gold valve. I have to run the preload adjusters all the way out to get minimum sag for my rider weight with gear on. I think Racetechs spring rate calculator is inaccurate for our bikes.
 

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Discussion Starter #29
Hi, i also have this problem... I bought the SP version of the MT-09, which comes with this shock preinstalled, and I tried to setup suspension the same way as you and I also have 0 static sag with all preload out...

I found some suapension tehnician and can't wait to go and see what he has to say, because I have another problem - My weight is 69kg with full gear and rear spring is to hard for me.
Can you unwind the top adjuster ring more? Do you have some space? If you do, you dont have a problem. If you cant, jut buy 85N/mm. And you have whole 10mm from prload knob of preload to add to fine tune it.
My problem is that i cant fix it.

My R1-R2 now with 115 is 0. And my R2-R3 is 34. If i get softer 170mm spring i will overshoot the R1-R3. And the damn spring rate is fine for me, it is not to hard, i can bottom it out while riding on bumps with COMP and 12. Im fanatic allways riding with zip ties both on shocks and forks...

I got response from Ohlins. No word on collar, bit as i asked about spring replacement with 160mm. Answer is that i can go with 160mm, BUT there is a catch that i knew. And that is that i CANT go lower than 149 of preloaded spring (spring free leng is shorter. That gives me 11 mm of max preload. There is another damn catch that Ohlins doesnt have harder 160mm spring for STX than 01091-39 110N/mm.
My mental calculations gave me 120N/mm for my problem for 160mm spring.
Ohlins guy is respected race tuner with lots of expirience, he thinks 110 N/mm 160 is enough, i dont.

My options by order of best solutions.

1. Get lower spring clip, 3mm lower clip should change averything, and that should be cheapest
2. Get 105N/mm 170mm and lose 10kgs :D I planed to lose weight...but damn corona :p
3. Listen to the Ohlins tuner get 160mm 110N/mm and gamble like with 5mm of preload from upper ring, and 5mm of adjustment from knob,a and i cant use all knob (up to 10mm).

I dont know who did calculations for this shock on this bike but Ohlins recomends 14mm of preload for this bike (thats 135kgs of preloaded force!!!), and no mater the linkage and geometry this is simply 2 much for this light bike to have free sag.
 

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I have the same issue with YA535 Ohlins shock myself... K95 spring and 0 free sag; the preload is set at 14mm so I can't understand where did go the 10mm free sag that Ohlins claims.

I did make several - step by step - suspensions upgrades and, finally, I have this shock and Ohlins NIX30 cartdrige in the front.
I have to go back to the suspension specialist on june 10th to change the fork springs (from K9,5 to 9,0; my weight is 85kg), so I will talk to the guy and see if he will be able to fix it in some way (less preload? K90 spring?).

As far as I know, MT09 came in the first place with zero free sag and the stock suspension - in my opinion - are the best devices for popping up wheelies and make the rear slide on hard breaking.

An interesting thing I discovered a couple of years ago is that the stock spring, that Yamaha claim to be linear K100, actually is a progressive 74-100. The news comes from the guy from the shop where I take the bike.
For the most part of the travel the K95 Ohlins spring is stiffer than the stock.

The Ohlins YA535+NIX30 are fenomenal but in my opinion the suggested springs are way too stiff and maybe this is part of the problem.

I tryed out the bike for the first time yesterday and on hard braking the rear is extremely close to slide; with no setting changes on the shock, I'm pretty sure that with softer 9,0 fork springs the bike will slide massively on hard braking.

I'll keep you updated
 

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You are totaly correct, kid was jumping all over me when i was writing. Shock travel is not reduced. Spring is reduced. Now is allmost 10PM here. Tomorrow i can show you the video of how i dont have free sag, and i can take pictures. I bought shock from local Yamaha dealer, who bought it from his friend from Italy or Austria (Shop)...dont remember... I can find damn clips for 10-20 Euros, but for TTX, not for STX. I dont get answer from local Ohlins in a week. Today i contacted main Ohlins.
Please find another reference for measurement, i have MK2. I will gladly compare my ride hight.
I realy like the shock, rebound damping is great, compression damping is great, preaload adjuster is great. But i dont know, maybe spring is more than 115N/mm, maybe it is to long. But im not stupid, R1-R2 is 0. And with this assembly i cant get it to 10mm.
Ty for trying to help.
OK. I'd still have a go at the dealer for selling you the wrong unit. Make him sort it.
 

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Discussion Starter #32
OK. I'd still have a go at the dealer for selling you the wrong unit. Make him sort it.
Ohlins said that they provided spring with best intentions. So...
I think i will lose weight, now 108, and get 105N/mm spring, and then order 9.5N/mm NIX30
 

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Good luck, I'm trying to lose Covid kilos too.
 
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Just to jump into this. I have pretty much the same shock and Im 105kg. Im running a 130 spring and no hydrolic preload adjuster. The ring adjusters are close to the top of the shock body.

I have 8mm free sag and 35mm rider sag. My punt is you are light on spring and need a different base plate to correct.
 

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Discussion Starter #35
What shock do you have? What do you mean as pretty much the same? There are 3 of us just on this tread with same problem with YA535.
 

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Discussion Starter #37
Just to jump into this. I have pretty much the same shock and Im 105kg. Im running a 130 spring and no hydrolic preload adjuster. The ring adjusters are close to the top of the shock body.

I have 8mm free sag and 35mm rider sag. My punt is you are light on spring and need a different base plate to correct.
I dont know where to get diferent base.
 

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Yes m8, i cant go lower than 10mm becouse adjuster cant go more back.
What is your R1-R2 (free sag) and your R1-R3 total static sag??? Im 109-11kgs honest(without gear).
If i have 33-34 mm drop when i sit and 2-3mm of static, acording to my wife. Spring is not that expensive, but chaniging it is pain in the ass, i cant change it myself.
Plse write your sag numbers, its same damn shock.

Interesting thing is that i can get 10mm from preload adjuster full in. P
reload is then 10 mm, it is great when i ride with my wife.
My solution is changing collar to smaller one, and i can adjust preaload with that upper ring. Maybe i can try 105N/mm...
I just changed a spring on a K-Tech shock and it's ridiculously easy. Probably is on an Ohlins also. 115 seems pretty stiff for 240 pounds. my 2 cents.
 
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