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Discussion Starter · #1 ·
Hi, is there supposed to be a tool in the toolkit, (KTM 1090 S), to adjust rear spring pretension, see attached?

If so could some kind person take a pic for me to identify it?

Thanks (y)
 

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Discussion Starter · #2 ·
Well, I have checked out the rear spring pretensioner and established that I need a 4mm dia pin wrench spanner at 20mm between pin centres - looks like the tool is fairly standard as used on some power tools to undo the collet securing cutting discs. Ordered on off ebay for a few pounds, may need to bend/adjust handle to clear spring coil and bodywork - all good fun! :)
 

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Discussion Starter · #4 ·
No, trust me to miss the obvious and look for an issue where one doesn't exist!
What a plonker, cheers It's not Ginger - I'll check it out later.
 

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Discussion Starter · #5 ·
39389


Well, maybe I wasn't a plinker after all.

Just tried using Allen key on the centre screw, manual said to turn counter clockwise all way then back in 2 turns. Started turning and oil pissed out, turned to tighten again but o ring is protruding so oil is still weeping out.

So my initial thoughts were correct that the 2 x 4 mm holes are the adjuster that requires a pin wrench spanner to adjust pre tension. The central hex screw is the oil reservoir filler plug.

Looks like I will now have to remove mono shock and get it refilled with oil 😥😖
 

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Discussion Starter · #6 ·
View attachment 39389

Well, maybe I wasn't a plinker after all.

Just tried using Allen key on the centre screw, manual said to turn counter clockwise all way then back in 2 turns. Started turning and oil pissed out, turned to tighten again but o ring is protruding so oil is still weeping out.

So my initial thoughts were correct that the 2 x 4 mm holes are the adjuster that requires a pin wrench spanner to adjust pre tension. The central hex screw is the oil reservoir filler plug.

Looks like I will now have to remove mono shock and get it refilled with oil 😥😖
* plonker not plinker
 

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Discussion Starter · #7 ·
Shock absorber fluid viscosity is detailed as SAE 2.5 in Technical Data of Owner's Manual.

(KTM pt: 50180751S1 is also listed in Tech Data - this appears to be 5 ltrs of shock absorber fluid for around £92).

Anyone have recommendations for best shock absorber fluid, sae 2.5, to use? - (0.5 ltrs should be more than enough).

I take it fork oil is the same as shock absorber fluid?

I'll check in the workshop manual for fluid change procedure and quantity of fluid required.
 

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Discussion Starter · #8 ·
Just checked the KTM 1090 Adventure Service Repair Manual and there is no info regarding changing rear shock absorber fluid - does anyone have any info on this or does this need to go to a suspension specialist?

Thanks for any advice on this.
 

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Flogged our 1090 18 months ago so cannot remember that well, but used to wind it right down for mrs and about mid way for myself and never had issue.
 

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View attachment 39389

Well, maybe I wasn't a plinker after all.

Just tried using Allen key on the centre screw, manual said to turn counter clockwise all way then back in 2 turns. Started turning and oil pissed out, turned to tighten again but o ring is protruding so oil is still weeping out.

So my initial thoughts were correct that the 2 x 4 mm holes are the adjuster that requires a pin wrench spanner to adjust pre tension. The central hex screw is the oil reservoir filler plug.

Looks like I will now have to remove mono shock and get it refilled with oil
Well that screw is a port to vacuum fill the preload adjuster,handle to adjust the spring preload would be on the other side.
If you have trouble getting that done let me know I'll stick it on the machine for you.
You would have to post the shock.
I'm pointing at the plastic but the adapter is connected to the fill port on this shock.


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Discussion Starter · #13 ·
Well that screw is a port to vacuum fill the preload adjuster,handle to adjust the spring preload would be on the other side.
If you have trouble getting that done let me know I'll stick it on the machine for you.
You would have to post the shock.
I'm pointing at the plastic but the adapter is connected to the fill port on this shock.


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Apologies to Its not Ginger, you were correct along with Doctor Lukas, I indeed was on wrong side of shock. Bike parked in garage so I was only looking at LHS of bike and area shown in manual looked same as what I was viewing. I'm a Numpty just didn't occur to me to check the other side as I was convinced what I was viewing was correct. Sorry to inconvenience you guys. I'm more than a bit annoyed with myself for making such a school boy error. So, I'm a bit confused that this screw is a fill point for both oil and Nitrogen. I would of expected a valve with right angle connector that you could connect nitrogen filling hose that after purging air from hose the valve could be opened to charge system. Are you UK based Doctor Lukas? When I opened the screw oil ran out but it did not spurt out like it was under pressure? Pic of the correct side makes it kind of obvious
 

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Apologies to Its not Ginger, you were correct along with Doctor Lukas, I indeed was on wrong side of shock. Bike parked in garage so I was only looking at LHS of bike and area shown in manual looked same as what I was viewing. I'm a Numpty just didn't occur to me to check the other side as I was convinced what I was viewing was correct. Sorry to inconvenience you guys. I'm more than a bit annoyed with myself for making such a school boy error. So, I'm a bit confused that this screw is a fill point for both oil and Nitrogen. I would of expected a valve with right angle connector that you could connect nitrogen filling hose that after purging air from hose the valve could be opened to charge system. Are you UK based Doctor Lukas? When I opened the screw oil ran out but it did not spurt out like it was under pressure? Pic of the correct side makes it kind of obvious
Hi yes based in New Addington Surrey
There is only oil in the preload adjuster.
If you just reset the screw with theo ring adjuster will work lee the oil that came out.
You will get like 80% of the total spring preload.
Oil and nitrogen is in the shock body. And them shock are fully rebuildable.

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Discussion Starter · #16 ·
Thanks for the info DoctorLukas - great to hear that the preload reservoir just contains hydraulic oil and no nitrogen (y)

I have a few more questions for you if that's ok: -

1) Do you know if the preload reservoir should be completely filled with fluid?

2) Can the fluid be mixed if I can't source original or should it be drained and changed out completely. (Shock absorber fluid viscosity is detailed as SAE 2.5 in Technical Data of Owner's Manual. KTM pt: 50180751S1 is also listed in Tech Data - this is for 5 ltrs of shock absorber fluid for around £92).

3) Can you recommend an alternative rear shock fluid SAE 2.5 weight in case original is n/a in smaller bottles? - (0.5 / 1 ltr should be more than enough).

Many thanks for your assistance, much appreciated.
 

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Thanks for the info DoctorLukas - great to hear that the preload reservoir just contains hydraulic oil and no nitrogen (y)

I have a few more questions for you if that's ok: -

1) Do you know if the preload reservoir should be completely filled with fluid?

2) Can the fluid be mixed if I can't source original or should it be drained and changed out completely. (Shock absorber fluid viscosity is detailed as SAE 2.5 in Technical Data of Owner's Manual. KTM pt: 50180751S1 is also listed in Tech Data - this is for 5 ltrs of shock absorber fluid for around £92).

3) Can you recommend an alternative rear shock fluid SAE 2.5 weight in case original is n/a in smaller bottles? - (0.5 / 1 ltr should be more than enough).

Many thanks for your assistance, much appreciated.
Well, it will be cheaper to post it to me and get it back the next day.
I can vacuum fill this for you. Just pay for delivery. £15 there and back?
If you wish you could use any hydraulic oil in the preload adjuster. I'm sure normal suspension fluid will be fine.
I use 2.5wt because that goes into the shocks and is in the machine. And yes it cost £80 per 5l of that stuff.
You could get Motul shock oil for £17 on eBay and it will mix no problem you only need 10cc at the most.
Preload adjuster needs to be backed off and the oil needs to go in under pressure to move the piston.is not attached to the screw look on the pictures of the BMW preload adjuster.
To get all the air out port should be vertical.
I hope this helps if not you know where to find me.

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Discussion Starter · #18 ·
Hi DoctorLukas, I have removed my rear mono shock this morning and would like to take up your kind offer to refill the pre-tensionor reservoir. Would it be ok if I drop the shock off to you and call back later to collect it or alternatively you could post it back to me at your convenience? I could bring it any day that suits you. Thanks
 

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Hi DoctorLukas, I have removed my rear mono shock this morning and would like to take up your kind offer to refill the pre-tensionor reservoir. Would it be ok if I drop the shock off to you and call back later to collect it or alternatively you could post it back to me at your convenience? I could bring it any day that suits you. Thanks
Pm'd you

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