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Leaky petcock -- how does vacuum leave petcock?
- KZB2 650
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10 May 2015 06:42 #671354
by KZB2 650
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.
Replied by KZB2 650 on topic Leaky petcock -- how does vacuum leave petcock?
I've got a second tank with a leaky petcock (too) and will get a manual one for it and not mess with the seals or a Pingle if I hit the lotto.
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.
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- floivanus
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10 May 2015 09:38 #671372
by floivanus
my bikes; 80kz1000(project), 77 gl1000, 74 h2 (project)
Past; 78 kz1000, 83 kz550
Andrew
Replied by floivanus on topic Leaky petcock -- how does vacuum leave petcock?
About 90% of the bikes i come across have workable vacuum petcocks, and as long as you clean them well (zero abbrasives at all) and replace the o-ring and lever seal they work great, I have had some that won't shut off or dribble though, and of course those get replaced with good manual valves, but the ease of the vac ones are always attractive.
And face it, if a faulty petcock floods your engine you have other issues as well (seems to be the biggest complaint with the vac style, set overnight and flood out the bike)
And face it, if a faulty petcock floods your engine you have other issues as well (seems to be the biggest complaint with the vac style, set overnight and flood out the bike)
my bikes; 80kz1000(project), 77 gl1000, 74 h2 (project)
Past; 78 kz1000, 83 kz550
Andrew
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- SWest
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- 10 22 2014
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10 May 2015 13:06 #671399
by SWest
Replied by SWest on topic Leaky petcock -- how does vacuum leave petcock?
I agree with the manual comments unless you are prone to forget to turn on the gas and fall down a lot. :woohoo:
Steve
Steve
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- LuckyLucOnBass
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10 May 2015 16:31 #671425
by LuckyLucOnBass
I have a stop sign two short blocks from home. When I get to that stop, I shut off the valve, get home, park, and wait for the next ride.
Also smart to make sure float needles are in working condition.
bass player, bike rider, hockey fan.
1983 KZ550 M1
Replied by LuckyLucOnBass on topic Leaky petcock -- how does vacuum leave petcock?
swest wrote: I agree with the manual comments unless you are prone to forget to turn on the gas and fall down a lot. :woohoo:
Steve
I have a stop sign two short blocks from home. When I get to that stop, I shut off the valve, get home, park, and wait for the next ride.
Also smart to make sure float needles are in working condition.
bass player, bike rider, hockey fan.
1983 KZ550 M1
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- SWest
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- 10 22 2014
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10 May 2015 17:08 #671426
by SWest
Replied by SWest on topic Leaky petcock -- how does vacuum leave petcock?
You shouldn't have to do that.
Steve
Steve
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- 650ed
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10 May 2015 17:16 - 10 May 2015 17:16 #671428
by 650ed
I agree this is usually the case, and usually the other problem is one or more faulty float valves. However, sometimes a faulty vacuum petcock can allow fuel to run down through the vacuum line into the #2 carb. In that case, the petcock itself may be the only problem. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Replied by 650ed on topic Leaky petcock -- how does vacuum leave petcock?
floivanus wrote: .....And face it, if a faulty petcock floods your engine you have other issues as well (seems to be the biggest complaint with the vac style, set overnight and flood out the bike)
I agree this is usually the case, and usually the other problem is one or more faulty float valves. However, sometimes a faulty vacuum petcock can allow fuel to run down through the vacuum line into the #2 carb. In that case, the petcock itself may be the only problem. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Last edit: 10 May 2015 17:16 by 650ed.
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