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Petcock leaking - 1977 KZ650 22 Sep 2022 17:46 #874287

  • BlackEyeCafe
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Hello

I have been having an issue with my petcock leaking very slowly but enough to cause issues.

It’s not leaking from the selector knob but rather from the outlet pipe even when the selector is in “off” mode. 

My assumption is that the plastic piece inside the petcock is not quite holding the seal. Does anyone have any other suggestions of things to look for or ways to fix the issue ?

Thanks in advance 
1977 KZ650 C
Jets - Main 115 - Pilot 17.5 - Needles - Position 3 - NGK BR7ES

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Petcock leaking - 1977 KZ650 22 Sep 2022 18:28 #874291

  • Nessism
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Time for a new petcock.  Check the bolt center to center spacing, then I'd go hunting on ebay.
Ed

Carburetor O-ring Kits For Sale: Mikuni VM & BS/CV, and Keihin CV34 (as used on KZ750E/H/N/Spectre)

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread

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Petcock leaking - 1977 KZ650 22 Sep 2022 19:17 #874294

  • gd4now
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If it is the stock non-vacuum powered petcock there is not much to it, see attached pic.  I have read of others using something like toothpaste to lap in so to speak that tapered plastic item and the port it fits into. Do not know if that will help or not?
1977 KZ650 B1
Pods and Denco header


This is my Z

OLD KAW OWNERS SMILE ALOT
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Petcock leaking - 1977 KZ650 22 Sep 2022 19:33 #874295

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It may be dirty inside.  I would disassemble it, carefully clean it, and put it back on to see if it still leaks.  Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Petcock leaking - 1977 KZ650 23 Sep 2022 06:14 #874310

  • ThatGPzGuy
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They are not hard to rebuild. Some attention to detail will get you smooth, leak-free, petcock. Here is a tutorial for rebuilding them. It is for Yamaha petcocks but the Kawasaki ones are similar.
How to rebuild vacuum operated petcocks
Jim
North GA
2016 Yamaha FJR1300ES
1982 GPz750 R1
1974 Kawasaki H1
1976 Kawasaki KZ400
1979 Yamaha XS650 cafe'
2001 KZ1000P
2001 Yamaha YZ426
1981 Honda XR200 stroked in an '89 CR125 chassis
1965 Mustang
1967 Triumph GT6
1976 Bronco
"If you didn't build it, it's not really yours"

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Petcock leaking - 1977 KZ650 25 Sep 2022 19:16 #874532

  • BlackEyeCafe
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Thanks for the tips. 

it is indeed the non-vacuum version and the culprit is likely that little piece of conical plastic. I will try cleaning everything with my ultrasonic cleaner and hope for the best. Does anyone make that plastic piece, Z1 doesn’t seem to carry them. 

Thanks
1977 KZ650 C
Jets - Main 115 - Pilot 17.5 - Needles - Position 3 - NGK BR7ES

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Petcock leaking - 1977 KZ650 25 Sep 2022 20:01 #874534

  • TexasKZ
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Looks like a project for somebody with a 3D printer…….
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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Petcock leaking - 1977 KZ650 26 Sep 2022 14:08 #874629

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Do you happen to know of such a person?  
1977 KZ650 C
Jets - Main 115 - Pilot 17.5 - Needles - Position 3 - NGK BR7ES

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Petcock leaking - 1977 KZ650 27 Sep 2022 04:28 #874660

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Give Pete a call. He makes some interesting stuff for the ZRX and a few other bikes. He might be interested in giving this a try if he has the time and if he could sell a few. I have bought from him several times and it has always been a great experience, and he likes to talk to enthusiasts.

www.kwick.biz/contact/
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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Petcock leaking - 1977 KZ650 27 Sep 2022 04:54 #874663

  • hardrockminer
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I don't know anyone who makes them.  They come up for sale occasionally on ebay as OEM parts.  Alternatively you might be able to find them from the company that makes the cheap replicas.
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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