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GPZ Master cylinder 25 Dec 2018 07:43 #795656

  • SWest
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Can anyone identify this? There's no markings as to what size it is. I need to get a rebuild kit for it before it ruins my tank.
Steve
Z1b1000 1975 Z1b
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GPZ Master cylinder 25 Dec 2018 08:35 #795657

  • old_kaw
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It's more than likely a 5/8" bore if it came off of a dual disk front end. It also has a casting boss on the front of it for a different hose location. All of this I assume you already knew, or suspected. It looks an awful lot like a Yamaha XS1000 MC to me. Take it apart and see what's inside. :-)
1981 Kawasaki Kz1000K1
Located in the Saint Louis, Missouri Area.
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GPZ Master cylinder 25 Dec 2018 09:32 #795659

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I don't remember what bike it came off of. I got it when I was wrenching at the cycle salvage in Indio. That would be in 88. There is one that looks lie this one on eBay for a GPZ 1100. It's junk but if it is the same a kit is available. I'll have to open it up again and measure the bore and compare parts.
Steve
Better pic


Z1b1000 1975 Z1b
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GPZ Master cylinder 26 Dec 2018 04:54 #795685

  • Wozza
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Looks like the the factory master cylinder from my 82 GPZ550 which make sense as all the early to mid 80's twin disk GPZ's and others used the same one
1982 KZ550H1
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GPZ Master cylinder 27 Dec 2018 04:08 #795750

  • CoreyClough
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Not knowing what the current one is, I'd buy a used one that you are more certain about, and rebuild it. For added information, I checked out Kawasaki's Diagrams, and the GPz550 uses the same front master with internals on the 82-83 H Model as the 84-85 A Model. Maybe a good time to switch to a remote reservoir master from a newer model?

'85 GPz550(ZX550-A2)

GPz550 Base Manual --> tinyurl.com/ze5b3qo
GPz550 Supplement Manual --> tinyurl.com/h34d2o6
GPz550.com --> www.nwsca.com/scripts/gpz_forum_2005/default.asp
First Race Win GPz550 --> tinyurl.com/o5y3ftp
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GPZ Master cylinder 27 Dec 2018 08:00 #795757

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I'm going to take it apart to compare parts. Looks like the GPZ 1100 kit will work. $15 shipped. I don't like plastic parts, that'
s why I like this one. The sight window is glass not PLASTIC.
Steve
Z1b1000 1975 Z1b
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GPZ Master cylinder 22 Jan 2021 15:14 #842201

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I ordered this one. Glad I made a clip of it with the measurements back then. The one I have gets spongy then builds up so I expect it to fail soon.
1982 KAWASAKI KZ 1100 B GPz1100 - FRONT BRAKE MASTER CYLINDER REPAIR REBUILD KIT
Buy It Now
This should work nicely and should be here Tuesday. B)
Steve
Z1b1000 1975 Z1b
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GPZ Master cylinder 27 Jan 2021 06:44 #842493

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Works perfect. B)
Steve

www.brakecrafters.com/
Z1b1000 1975 Z1b
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GPZ Master cylinder 30 Jan 2021 16:39 #842704

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Super quick shipping. B)
Steve
Z1b1000 1975 Z1b
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