12425 - Established June, 2013 - all GRiSO, all the time...
 
HomeFAQRegisterLog in
Share | 
 

 Reworking Sachs shock ...

Go down 
Go to page : Previous  1, 2
AuthorMessage
usedtobefast
Tanabuso
Tanabuso
avatar

Posts : 71
Join date : 2018-08-28

PostSubject: Re: Reworking Sachs shock ...    Fri Nov 16, 2018 4:44 pm

Ok, need some help.  There should be a schrader valve on the end of the reservoir, but there isn't.   scratch

So it looks like this:

[You must be registered and logged in to see this image.]


It should look like this:

[You must be registered and logged in to see this image.]

Here is a guy with a Honda shock ... reservoir has an end cap, he drills a hole and pries the cap off ...  Suspect  affraid

[You must be registered and logged in to see this image.]
[You must be registered and logged in to see this image.]

And underneath is the valve.

[You must be registered and logged in to see this image.]



Is it time to get bold and drill into that cap??   affraid
Back to top Go down
ghezzi
Fra Cristoforo
Fra Cristoforo
avatar

Posts : 2583
Join date : 2014-05-22
Age : 61

PostSubject: Re: Reworking Sachs shock ...    Fri Nov 16, 2018 7:22 pm

What could possibly go wrong?
I recommend starting with a 6 pack.
Back to top Go down
http://www.biketowbrisbane.com.au
usedtobefast
Tanabuso
Tanabuso
avatar

Posts : 71
Join date : 2018-08-28

PostSubject: Re: Reworking Sachs shock ...    Fri Nov 16, 2018 9:07 pm

For info about shim stacks, here is an old video with good info.  More dirt moto oriented, but good explanation of concepts.

[You must be registered and logged in to see this link.]
Back to top Go down
sideshowbob
Tiradritto
Tiradritto
avatar

Posts : 355
Join date : 2017-08-06
Age : 64

PostSubject: Re: Reworking Sachs shock ...    Sat Nov 17, 2018 12:42 pm

Drill a small hole. Screw a sheet metal screw part way in. Hook your slide hammer to the screw head and pop er out.
Back to top Go down
usedtobefast
Tanabuso
Tanabuso
avatar

Posts : 71
Join date : 2018-08-28

PostSubject: Re: Reworking Sachs shock ...    Sat Nov 17, 2018 3:49 pm

sideshowbob wrote:
Drill a small hole. Screw a sheet metal screw part way in. Hook your slide hammer to the screw head and pop er out.

Yup.  It is crazy ... taking a drill to a shock that supposedly has ~ 150lbs of nitrogen behind it.  affraid  Scary moments.  When it released it was just a small psssstt.  Nothing to worry about at all!

I have no idea how Sachs fills these to start with.  

All apart now.  

For refilling, options are:

1. Drill hole in center to proper size, tap threads, install a schrader valve (with bolt loctited on the inside)
2. Get an end cap from a dirt bike Sachs shock
3. Get an end cap from some place like RaceTech

#3 looks like this:
[You must be registered and logged in to see this image.]
Back to top Go down
GHTE
Sfregiato
Sfregiato
avatar

Posts : 413
Join date : 2015-02-09
Age : 65

PostSubject: Re: Reworking Sachs shock ...    Sun Nov 18, 2018 12:34 pm

Keep going, very interesting.
Back to top Go down
https://glennhilleard@gmail.com
Georgios
Squinternotto
Squinternotto
avatar

Posts : 9
Join date : 2018-07-12

PostSubject: Re: Reworking Sachs shock ...    Thu Nov 22, 2018 1:18 pm

I wouldn´t drill a hole. It´s archaic und brutal to do so.

I would ask a shock service shop how they do it and would follow their advice.

Just my 2 cents.
Back to top Go down
Oz1200Guzzi
Don Abbondio
Don Abbondio
avatar

Posts : 3175
Join date : 2014-03-13
Age : 64

PostSubject: Re: Reworking Sachs shock ...    Thu Nov 22, 2018 2:50 pm

usedtobefast wrote:
For info about shim stacks, here is an old video with good info.  More dirt moto oriented, but good explanation of concepts.

[You must be registered and logged in to see this link.]

That is a damned good video - I actually learned something today. Thanks heaps.
Back to top Go down
usedtobefast
Tanabuso
Tanabuso
avatar

Posts : 71
Join date : 2018-08-28

PostSubject: Re: Reworking Sachs shock ...    Thu Nov 22, 2018 4:31 pm

Georgios wrote:
I wouldn´t drill a hole. It´s archaic und brutal to do so.

I would ask a shock service shop how they do it and would follow their advice.

Just my 2 cents.

I talked with 3 suspensions shops ... all 3 said drill a hole. There really is no other method.
Back to top Go down
Georgios
Squinternotto
Squinternotto
avatar

Posts : 9
Join date : 2018-07-12

PostSubject: Re: Reworking Sachs shock ...    Fri Nov 23, 2018 2:45 am

usedtobefast wrote:


I talked with 3 suspensions shops ... all 3 said drill a hole.  There really is no other method.  

In this case, you´re on the safe side. Still can´t unterstand why Sachs did it this way. There are better ones.
Back to top Go down
Dilliw
Tanabuso
Tanabuso
avatar

Posts : 99
Join date : 2016-02-17
Age : 55

PostSubject: Re: Reworking Sachs shock ...    Fri Nov 23, 2018 6:25 am

Georgios wrote:
usedtobefast wrote:


I talked with 3 suspensions shops ... all 3 said drill a hole.  There really is no other method.  

In this case, you´re on the safe side. Still can´t unterstand why Sachs did it this way. There are better ones.

This is what mine looks like after Traxxion got through with it.

[You must be registered and logged in to see this image.]

Underneath the "shock condom" they went with a re-valve and a 750lb spring for my fat arse.  A little more travel would be nice but otherwise I think this is as good as I'd ever need it to get.

$400 total.
Back to top Go down
usedtobefast
Tanabuso
Tanabuso
avatar

Posts : 71
Join date : 2018-08-28

PostSubject: Re: Reworking Sachs shock ...    Thu Dec 06, 2018 4:28 pm

I might have to call them up about that reservoir end cap.  Does not look like a stock one that just had a schrader valve added.

So a little update ... I'm a bit stuck on a few things.

1. Reservoir end cap ...
   A) I kind of messed mine up when I drilled the "vent out the nitrogen" hole ... so the "drill hole, tap threads, install schrader valve" plan might not work so well.
   B) My stock cap measures 45.77mm in diameter.  RaceTech sells one that is 46mm.  So, 0.23mm too large.  Seems like this is an area to be precise.  Smile  But maybe that would work.
   C) I called a few suspension places ... theory was a Sachs dirt bike shock might have the same size end cap.  No one had one, and no one seemed to know how to order one.  

2. Rear spring.  Read a lot.  Searched a lot.  Got a bit confused.  Found some new ones.  Matched new part numbers up with other bikes.  Seems a particular year GSXR shock uses the same spring.  So, off to eBay, and they had the exact shock, $25 and free shipping.  I'm hoping for a Christmas miracle!  Here's my dream ... the spring works ... the reservoir end cap is the same size ... the shims in the shock are the same as what I need to revalve mine!  Very Happy Idea cheers  But hopefully at least the spring will work.

Off for a 1.5 week trip and then my shock will be here and I'll see what kind of miracle might occur.  Smile
Back to top Go down
 
Reworking Sachs shock ...
Back to top 
Page 2 of 2Go to page : Previous  1, 2

Permissions in this forum:You cannot reply to topics in this forum
GRiSO ghetto :: The Ghetto :: GRiSOLOGY-
Jump to: