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GS1000G Rear Master Cylinder replacement

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Guest

Guest
My 81 GS1000G I just pulled out of storage has a roached rear master cylinder. So far, soaks in carb dip, compressed air, nothing will budge the old piston so I can rebuild it. Somebody suggested you could install a grease fitting and use grease to push it out.

What I am wondering is if there are other, maybe newer bikes where the odds of finding a replacement in good shape are better. I know Suzuki used a very similar design for a long time.

Edit: Before you ask, yes the circlip has been removed,
 
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It probably interchanges with lots of Suzukis of various vintage. Find a part number on a parts vendor's site, then find on the same site a tool for looking up part numbers. It'll give you a list of bikes the same part is used on. I doubt you'll find a part number for a complete master, but a search on the master body might be good enough. Maybe cross reference with some other parts that might be different on other bikes. I can tell you right away that the '79-81 GS 850 interchanges, probably the 850 and 1000GL too.

A used part from a salvage yard selling on eBay should be serviceable.
 
Lots of Suzukis use this one


 
Just a quick "for future reference".

The trick to getting a stuck rear master apart (frozen piston) is a 1/8 grease nipple. It threads right on and then use the grease to push the piston out.
 
I think the DL650 one would be a decent fit as well, you may not need the sleeve nut as the shaft is longer, other than that it appears to be the same master as the EX300 one... :)

The 300 one is more plentiful and cheaper on that auction site for much newer parts though (or at least it was).

Mine is still working fine after quite a few miles :)
 
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After finding the grease nipple trick to get it apart and seeing the bore of my stock one is actually pretty good, decided to just rebuild it.
 
Just say'in, A few yrs. back, I got a rebuild kit for my front GS1100E master, from "ALL BALLS Racing" about 1/2 of the parts fit & 1/2 didn't fit. I was in a hurry, didn't give them a chance to straighten it out, just used their parts & reused some of my parts & got it going.
 
rphillips said:
Just say'in, A few yrs. back, I got a rebuild kit for my front GS1100E master, from "ALL BALLS Racing" about 1/2 of the parts fit & 1/2 didn't fit. I was in a hurry, didn't give them a chance to straighten it out, just used their parts & reused some of my parts & got it going.
Click to expand...

My internals are trashed, so here's hoping my rebuild kit (I think it's a K&L) fits.
 
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