GSX1400 Owners .org

Technically Speaking => Suspension => Topic started by: Smokegetsinyoureyes on Wednesday, 27 August 2025, 05:52 PM

Title: Rear shock compression damping Adjuster
Post by: Smokegetsinyoureyes on Wednesday, 27 August 2025, 05:52 PM
I've just noticed a weep of oil from one of my rear shocks from around the compression damping adjuster thumbwheel at the bottom of the shock.
Is this the common problem often talked about? Is it easily fixed? Is this the thing where the 5mm drain screw is removed and the oil replaced with heavier oil???
All advice appreciated 😉
Title: Re: Rear shock compression damping Adjuster
Post by: grog on Wednesday, 27 August 2025, 06:13 PM
Smokey, a long time since this has been discussed. Mine leaked, must be 12 yrs ago. Yes, i removed screw and refilled with gear oil.From memory took a few goes to get air out. Think mine is on 4 rings, what i wanted. Have never tried to adjust as not needed to. Never leaked again, if changing setting, solo to pillion all the time,probably other shocks required. Ive never bothered as stockers work fine for me, others bloody expensive. just IMO.
Title: Re: Rear shock compression damping Adjuster
Post by: Hooli on Wednesday, 27 August 2025, 06:29 PM
Sounds like the fault discussed in Seth's old thread https://gsx1400owners.org/forum/index.php?topic=130.0
Title: Re: Rear shock compression damping Adjuster
Post by: Smokegetsinyoureyes on Wednesday, 27 August 2025, 06:42 PM
Quote from: grog on Wednesday, 27 August  2025, 06:13 PMSmokey, a long time since this has been discussed. Mine leaked, must be 12 yrs ago. Yes, i removed screw and refilled with gear oil.From memory took a few goes to get air out. Think mine is on 4 rings, what i wanted. Have never tried to adjust as not needed to. Never leaked again, if changing setting, solo to pillion all the time,probably other shocks required. Ive never bothered as stockers work fine for me, others bloody expensive. just IMO.
thanks for the reply, I'll prob try the heavier oil thing and see how it goes!
Title: Re: Rear shock compression damping Adjuster
Post by: Irish in Oz on Wednesday, 27 August 2025, 07:35 PM
Mate I recently stripped mine down but found there was no damping on one side so I replaced with basic set of Hagon.
I made a spring compressor if you want to borrow it.
Title: Re: Rear shock compression damping Adjuster
Post by: Smokegetsinyoureyes on Wednesday, 27 August 2025, 07:50 PM
Quote from: Irish in Oz on Wednesday, 27 August  2025, 07:35 PMMate I recently stripped mine down but found there was no damping on one side so I replaced with basic set of Hagon.
I made a spring compressor if you want to borrow it.
Thanks for the offer Jeff, I've a couple of sets of home made compressors, one set made from beam clamps for hanging trunking and another from large injector clamps, I'd quie like to try and fix the standard one as I like the look of them, and I don't like to be beaten!!!!
Title: Re: Rear shock compression damping Adjuster
Post by: Hooli on Wednesday, 27 August 2025, 08:59 PM
Be warned there's an internal O-ring that's made of unobtainium if you strip them all the way down. It's why the company who were rebuilding them in the UK stopped offering that service.
Title: Re: Rear shock compression damping Adjuster
Post by: Irish in Oz on Wednesday, 27 August 2025, 10:02 PM
After I stripped mine down and no damping. I thought whats the point in doing it myself even if I source a seal and I've done that many times in industry. How would I recharge the nitrogen and how much does it require, can someone enlighten me.
Anyway the originals are stripped and may be useful for parts.
Title: Re: Rear shock compression damping Adjuster
Post by: Andre on Thursday, 28 August 2025, 05:34 PM
10 BAR (use online calculator for conversion to PSI) is the standard pressure for rear shocks. Holds true for my after-market shocks (YSS), confirmed by company tech. Proper nitrogen-kit will set you back a few 100 bucks. Be carefull, as you are dealing with very high pressures (up to 200 BAR) and an asphyxiating gas!
Title: Re: Rear shock compression damping Adjuster
Post by: Irish in Oz on Friday, 29 August 2025, 04:32 AM
Quote from: Andre on Thursday, 28 August  2025, 05:34 PM10 BAR (use online calculator for conversion to PSI) is the standard pressure for rear shocks. Holds true for my after-market shocks (YSS), confirmed by company tech. Proper nitrogen-kit will set you back a few 100 bucks. Be carefull, as you are dealing with very high pressures (up to 200 BAR) and an asphyxiating gas!

That why I can't see the point in bothering, just buy new shocks.