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Modern replacement shock absorber for GSX750ES

  • Thread starter Thread starter GSX750ES junky
  • Start date Start date
YSS makes reasonably priced shocks that are high quality. Their shocks are even getting more expensive as their name grows. Works Performance and Hagon both make shocks for these bikes.
 
I bought the 50$ monster 900 from ebay.
Rich from "sonic springs" is doing some calculations for me and I'll buy his springs for the front end.
 
How heavy are you? Stock spring run at full preload on the Duc shock is about right for me. A little on the stiff side. I am 165lb.
 
Should be fine at full pre-load for you then. From memory I am running the damping about halfway through it's adjustment. 10 clicks I think. It's a bit tricky to get to it to adjust after fitting, you might want to look at fitting it both ways (you can fit it either way, with the adjuster 45 degrees to front or 45 degrees to back) to see which gives best access. On mine it didn't matter that much.....
 
Based on the recommendation of Salty monk I purchased a used rear shock from a Ducati Monster 900.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=190494460489&ssPageName=STRK:MEWAX:IT
"This came off a well running, 2000 Ducati Monster M900 with 17,184 known miles on it"

There is a motorcycle workshop near my house owned by an ex Paris Dakar participant with golden hands. He said he can take care of my Ducati 900 shock and replace it's oil for 130$.
Assuming everything is now disassembled would you do that ?
A rear shock that ran 10 years on a street bike needs maintenance ?
 
I didn't.... but mine was off a very low mileage bike as well. I would put it on, see if you like it first.
If the $130 includes supplying & changing the seal & filling with Nitrogen again then that's a pretty good deal I would think (but I'd still give it a go first).

When you take the spring off you'll be able to check:

a. damping & adjustment is working fine (with the spring off)
b. it's not leaking
 
This is one of the options for the rear shock


--------------------------------------------------------------------------------

'86 and '87 GSX-Rs have the same type ends on the shock. The spring rate would probably be too light, but adjusting preload should take care of that. Not sure of the length on them from eye to eye though.


Originally posted by Billy Ricks.
 
salty_monk said:
I didn't.... but mine was off a very low mileage bike as well. I would put it on, see if you like it first.
If the $130 includes supplying & changing the seal & filling with Nitrogen again then that's a pretty good deal I would think (but I'd still give it a go first).

When you take the spring off you'll be able to check:

a. damping & adjustment is working fine (with the spring off)
b. it's not leaking
Click to expand...

Does it have both oil and nitrogen damping ?
Will both be required to be replaced in case of malfunction ?
 
Clone said:
This is one of the options for the rear shock


--------------------------------------------------------------------------------

'86 and '87 GSX-Rs have the same type ends on the shock. The spring rate would probably be too light, but adjusting preload should take care of that. Not sure of the length on them from eye to eye though.


Originally posted by Billy Ricks.
Click to expand...

http://www.gixxer.com/forums/showthread.php?t=198803&highlight=shocking+condition

none of the GSXR 1st gen shocks are 330mm. 315mm at most

EDIT:
In the case of the SU635 it can be extend by 0.6" ???????

EDIT: Ohlins confirmed that 17mm can be added making the shock 315+17=332mm or 13.07" Apparently stroke is increased as well.
Click to expand...
http://www.gixxer.com/forums/showthread.php?t=266658&highlight=ohlins+shock
 
Last edited:
Today I opened the front fork.
The springs were 20mm shorter than service limit. The sonic spring replacement is on its way.
The oil was an extreme version of a rotten eggs soup. No surprises after 26 years I guess...
I also noticed that the oil seals are leaking and this surprised me since the previous owner replaced them 2 years ago.
1. Could it be due to friction with the corrosion on the chromed stanchions (see picture) ?
2. Do I need to replace them ? In case I need to replace them, can I trust these after market ones ?
http://cgi.ebay.com/SUZUKI-GSX750-G...98?pt=UK_Motorcycle_Parts&hash=item3364fe229a
3. The dust seals look OK. Should I replace them if I replace the oil seal ?
 
GSX750ES junky said:
Which year Ducati monster ?

On the stock I measured 325mm from hole to hole.

This one is 12'' (304mm).
http://cgi.ebay.com/ebaymotors/DUCA...6185683QQptZMotorcyclesQ5fPartsQ5fAccessories

This one the picture shows 330mm
http://cgi.ebay.com/ebaymotors/Duca...4460489QQptZMotorcyclesQ5fPartsQ5fAccessories

Come to think of it...Is it wise to put a 10 years old shock ?
Why not buying a new one ?
Click to expand...

Salty Monk,
The other day you told me that you managed to fit the shock on the second link (Ducati Monster 900 year model 2000) onto your GSX750ES.
I bought it for 50$. It seems to be in pretty good condition but since I restore my GSX750ES with no compromises I decided to ask a friend of mine who runs a shop that restores high end shock absorbers to replace the oil, gas and oil seal.
This guy is a real pro but somehow he faced difficulties that he didn't face yet:
In the picture below you can see a red arrow pointing at a golden cap.
I quote what he said:
" I opened the golden cap and at this point (in all previous shock absorbers I dealt with) under the golden cap you push X which enables you to remove Y. Y secures the chrome rod. Unfortunately I'm not able to push X and I do not want to apply to much pressure because there might be a possibility that this shock is designed differently than all the ones I dealt with".

Any idea ?
 
I talked to our main Ducati dealer and he says that these Sachs shocks from early 2000's cannot be serviced. Well, they can but it is very hard and very expensive. I decided to leave it as is. After all, the eBay seller says it had only 17,000 miles. Considering the way it looks it makes sense.

Salty Monk,
This shock was designed to a 170kg motorcycle. Our beloved GSX750ES weighs 220kg.
Did this shock work fine for you without having to replace the spring to a stiffer one ?
I mean...when you ride solo you apply the same weight as a couple of people would on the original Ducati Monster.
 
I tried it with the Ducati spring. Way too stiff with my 160lb butt... The leverage ratio on the ducati must be way higher.

I swapped the stock spring onto the Duc shock, the shock allows you to run more preload than the stock one & it worked out fine...
 
"I tried it with the Ducati spring Way too stiff ..."

1. When you say Ducati spring you mean the yellow one that came with the spring I bought ? I only got it with a yellow one.
2. What is the stock one ? An additional spring from Sachs (what color) ?
3. If I understand correctly, a spring that came from a "too light bike" would not necessarily be too soft because each bike has its own suspension mechanism with its own leverage ratio...
 
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