6 replies to this topic

[Culejules]

Does anyone have experience of adjusting the YSS shock?

I fitted a new one a few months back and have been slowly trying to set it up to my liking.

I wound it out to max length ok and have sussed out the damping, but adjusting the preload is not going according to plan. I'm very tall and pretty heavy so I'm trying to set the preload as high as possible. Trouble is when I use the c-spanner on the castellated ring nut, it seems to be unscrewing the cylinder from the top mount rather than compressing the spring (see photo) 😕. Can anyone shed any light?

(I have remembered to slacken off the grub screw 😉)

Thanks in advance

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[fixitsan]

When you look at the adjusting ring, inside one of the threaded holes there will be a grubscrew which is locking the adjusting ring to the shock tube.

Slackening the grubscrew with the correct sized allen key should stop it from happening.

I would make sure you have first of all turned it so that the shock tube is tightened back up into the top mount cap first.

[Culejules]

Thanks for the reply fixitsan.

This is why I'm confused, I've already slackened the grub screw right off.

It's like there nothing stopping it from unthreading from the top mount, you'd think there would be a screw to lock it off at that end too...

[steve27bha]

 - and take the load off the suspension by using the centre stand or somehow else holding up the rear end with the wheel and swingarm disconnected from the ground.

 - and add a bit of oil between the top of the spring and the castellated nut ring.

 - and check there isn't another grub screw.

 

You don't just set the preload "high" but adjust the sag to your weight. Go read up after a search for how to do it. If you bought the shock new I would expect you were offered to specify your weight so the supplier could use an appropriate spring with the correct rate.

 

This video is a fair intro. to the method:-

Edited by steve27bha, 05 August 2021 - 09:50 pm.

[fixitsan]

Is the spring which is fitted suitable for your weight ?

As rider weight increases then so too must the spring rate, because adjusting preload is actually only adjusting the ride height when the actual firmness of the spring stays the same through the range of possible height adjustments

[Culejules]

Thanks for the replies folks.

Issue resolved. I've done this plenty of times but never had the thing try to disassemble itself before.

Whipped the shock off again and got it on the bench. It turned out that the grub screw had crushed the thread slightly. Only a bit, but enough to make unscrewing the body from the top mount rather than moving the ring nut downwards the path of least resistance. Got a needle file and dressed the thread a bit and now all is well.

[fixitsan]

Thanks for the replies folks.

Issue resolved. I've done this plenty of times but never had the thing try to disassemble itself before.

Whipped the shock off again and got it on the bench. It turned out that the grub screw had crushed the thread slightly. Only a bit, but enough to make unscrewing the body from the top mount rather than moving the ring nut downwards the path of least resistance. Got a needle file and dressed the thread a bit and now all is well.
 

Happy days. I haven't heard of the top cap unscrewing so easily, maybe it's just a one-off