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TOPIC: 1979 KZ650 Petcock

1979 KZ650 Petcock 12 Jul 2018 17:13 #786868

  • Pyrotechx
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Hello, 

I am new to the forums and was hoping I could find some help. I just recently purchased a '79 KZ650B. I rode it a bit, but once parked, leaks fuel. I pulled the petcock and in the "on" position was leaking fuel as if the bike was on. I purchased a rebuild kit and very carefully rebuilt it, which worked for about a day. 

Now it is leaking again. I want to switch over to a manual petcock (or even a vacuum petcock that actually works), but CANNOT seem to find one online anywhere that will fit. It looks like the bolt holes are 44mm across, but I cannot find a reliable source for a petcock.

Has anyone encountered this issue? I really want to get back to riding. 

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1979 KZ650 Petcock 12 Jul 2018 18:15 #786869

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Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

1979 KZ650 Petcock 12 Jul 2018 19:39 #786873

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SWest wrote: Looks like this will work.
Steve
www.z1enterprises.com/petcock-vacuum-suzuki.html
www.z1enterprises.com/catalogsearch/result/?q=petcock


That one looks a bit shady for $50. I wonder if they come with warranties... So far not having luck with vacuum petcocks.

Another idea was to cut the fuel line and add an inline fuel valve. What are your thoughts?

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1979 KZ650 Petcock 13 Jul 2018 05:44 #786883

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Here's one that you might be able to use. custom made in the USA. Be sure to check his other items, as he has various fuel valves.
If the mounting plate is the wrong size, the guy might have what you need or maybe he could make one real quick for you.

KZ650 etc MANUAL GAS TAP PETCOCK FUEL VALVE


....

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Last edit: by martin_csr.

1979 KZ650 Petcock 14 Jul 2018 16:51 #786958

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1981 KZ650-D4, with 1981 z750L engine.

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

1979 KZ650 Petcock 14 Jul 2018 18:01 #786960

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That one was used on the KZ1000P police bikes & should be readily available.
I believe the 51023-1375 part number supersedes the earlier 51023-1039 fuel tap found on some of the KZ models.

From Partzilla >> 2005 KZ1000-P24 Police >> FUEL TANK (P21/P22/P24) >> TAP-ASSY,FUEL 51023-1375

Manual fuel valve. Here's another one. CUSTOM NEW AFTERMARKET MANUAL FUEL VALVE
In regards to the 650-CSR mentioned in his description, it won't fit the 81 KZ650-H1 model as the bolt hole spacing on those is 34mm.

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Last edit: by martin_csr.

1979 KZ650 Petcock 15 Jul 2018 02:41 #786971

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I have had the very same problems with my CSR1000. Drove me crazy. In the end I cut the line and fitted an on/off tap. A cheap and cheerful fix. Problem solved.

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