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77' KZ650B-1 fuel petcock. Can it be rebuilt?
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77' KZ650B-1 fuel petcock. Can it be rebuilt? 17 Dec 2020 11:56 #840238

  • 650ed
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No sealant is needed. Be sure to use the CORRECT washers when installing the petcock. The correct ones are made of nylon so they do not leak. Ed

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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77' KZ650B-1 fuel petcock. Can it be rebuilt? 17 Dec 2020 12:42 #840240

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Thank you 650ed!Are those the washers that are listed in the parts diagram? The only reason I ask is that the washers that are on there now are metal. Thanks!

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77' KZ650B-1 fuel petcock. Can it be rebuilt? 17 Dec 2020 13:23 #840241

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I believe they are. The image and link below should help explain. Ed



www.partzilla.com/product/kawasaki/92022...aEAYYASABEgJe-_D_BwE

Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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77' KZ650B-1 fuel petcock. Can it be rebuilt? 17 Dec 2020 14:07 #840244

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Thank you. Wasn't sure if those were the nylon ones. Thanks!!!

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77' KZ650B-1 fuel petcock. Can it be rebuilt? 17 Dec 2020 17:13 #840249

  • hardrockminer
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If you noticed item 11 in Ed's diagram you will see an o ring that sits between the petcock and your tank.
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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77' KZ650B-1 fuel petcock. Can it be rebuilt? 18 Dec 2020 06:46 #840269

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The few petcocks I have messed with had plastic (nylon?) washers, but I bet a soft aluminum or copper washer could seal there as well, much like an oil drain bolt.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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77' KZ650B-1 fuel petcock. Can it be rebuilt? 18 Dec 2020 07:00 #840270

  • martin_csr
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A good hardware store may have nylon washers. There's one near me. I don't know what HD or Lowes would have.
Also, if you need the big o-ring, a metric nitrile o-ring kit has a couple of sizes that should work. It's what I used, since I
already had the kit. It takes some manual dexterity to fit a round o-ring into an oblong hole, but it was easy.

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77' KZ650B-1 fuel petcock. Can it be rebuilt? 18 Dec 2020 08:55 #840278

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martin_csr wrote: A good hardware store may have nylon washers. There's one near me. I don't know what HD or Lowes would have.
Also, if you need the big o-ring, a metric nitrile o-ring kit has a couple of sizes that should work. It's what I used, since I
already had the kit. It takes some manual dexterity to fit a round o-ring into an oblong hole, but it was easy.


You could use a couple dabs of grease in the groove to retain it long enough till it gets tightened against the tank.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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77' KZ650B-1 fuel petcock. Can it be rebuilt? 18 Dec 2020 10:19 #840283

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Good suggestion, but grease might not hold that o-ring in place. It's kind of big n fat.
With everything dry, it was pretty easy. w grease, maybe not. ???

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77' KZ650B-1 fuel petcock. Can it be rebuilt? 19 Dec 2020 08:38 #840320

  • gordone
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I have used oring with washer when I not have had the nylon washer.
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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77' KZ650B-1 fuel petcock. Can it be rebuilt? 25 Dec 2020 19:04 #840584

  • Kozman011
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Thanks everyone! All parts that are able to be purchased for the OEM petcock have been purchased. When I get them installed, I'll update on my success/failure. Merry Christmas to all!!

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