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Petcock Problem
- mseems
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- 1982 KZ 550 A3
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17 May 2009 19:03 #292193
by mseems
Petcock Problem was created by mseems
Hello,
I have a problem with my petcock. It is gravity fed and doesn't work right. The only way gas flows is by putting it to the On setting so it flows constantly then I have to remember to shut it off when I stop. I would like to know if I can fix this by buying a petcock repair kit or should I just by a whole new one. Also anybody know which petcock I should order from Z1 for the 82 kz550 A3?
Thanks
I have a problem with my petcock. It is gravity fed and doesn't work right. The only way gas flows is by putting it to the On setting so it flows constantly then I have to remember to shut it off when I stop. I would like to know if I can fix this by buying a petcock repair kit or should I just by a whole new one. Also anybody know which petcock I should order from Z1 for the 82 kz550 A3?
Thanks
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- Locozuna
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17 May 2009 19:13 #292200
by Locozuna
KZ900LTD, KZ750LTD, KZ650, 72'Triumph Trident
"Over the Mountains
Of the Moon,
Down the Valley of the Shadow,
Ride, boldly ride,"
The shade replied
"If you seek for Eldorado!"
Replied by Locozuna on topic Petcock Problem
If it has an off position it IS operating correctly. If it has a PRI (prime) setting it is a vacuum petcock and will ALWAYS pass gas in the PRI position but should only (pass gas) when the engine is running and in the RUN position.
KZ900LTD, KZ750LTD, KZ650, 72'Triumph Trident
"Over the Mountains
Of the Moon,
Down the Valley of the Shadow,
Ride, boldly ride,"
The shade replied
"If you seek for Eldorado!"
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- mseems
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- 1982 KZ 550 A3
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17 May 2009 19:36 #292204
by mseems
Replied by mseems on topic Petcock Problem
Yes but this one will not pass gas in the run position when the engine is running. Eventually the bike dies because it doesn't get gas. The only way I can run it is in the prime position but gas constantly flows. It shouldn't work like this right?
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- Patton
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- KZr Legend
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17 May 2009 21:20 #292251
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic Petcock Problem
PRI position does not require vacuum to allow fuel flow.
Other petcock positions do require vacuum to allow fuel flow.
Is vacuum tube from carb attached to petcock?
Good Luck!
Other petcock positions do require vacuum to allow fuel flow.
Is vacuum tube from carb attached to petcock?
Good Luck!
1973 Z1
KZ900 LTD
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- mseems
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- 1982 KZ 550 A3
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17 May 2009 21:24 #292257
by mseems
Replied by mseems on topic Petcock Problem
Yes there is a vacuum line and I was aware that it didn't require vacuum in the pime position. That is why I set it to prime so it will run. Otherwise gas doesn't flow in the on position, even when its running, like it should. Could that be lack of vacuum coming from the vacuum hose or a jacked up petcock?
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- Patton
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17 May 2009 22:12 #292315
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic Petcock Problem
Would first assure vacuum being supplied to petcock.
If petcock fails to allow fuel flow in positions other than PRI, would then consider the petcock repair kit from Z1E.
Good Luck!
If petcock fails to allow fuel flow in positions other than PRI, would then consider the petcock repair kit from Z1E.
Good Luck!
1973 Z1
KZ900 LTD
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- Locozuna
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18 May 2009 05:41 #292362
by Locozuna
KZ900LTD, KZ750LTD, KZ650, 72'Triumph Trident
"Over the Mountains
Of the Moon,
Down the Valley of the Shadow,
Ride, boldly ride,"
The shade replied
"If you seek for Eldorado!"
Replied by Locozuna on topic Petcock Problem
You should be able to draw enough on that vac hose to make the fuel run. It really does not take much. Just to confirm you have a petcock problem. If you don't want to do it get Paris....she checks all my batteries.
If she's still no good a re-build kit from Z1 should put it straight. BTW where is the vac tube getting its draw from? We picked up a parts bike from a JunKyard and it seemed like every hose on the bike was filled with a mud wasp plug.
If she's still no good a re-build kit from Z1 should put it straight. BTW where is the vac tube getting its draw from? We picked up a parts bike from a JunKyard and it seemed like every hose on the bike was filled with a mud wasp plug.
KZ900LTD, KZ750LTD, KZ650, 72'Triumph Trident
"Over the Mountains
Of the Moon,
Down the Valley of the Shadow,
Ride, boldly ride,"
The shade replied
"If you seek for Eldorado!"
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- bigkaw815
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18 May 2009 12:11 - 18 May 2009 12:12 #292434
by bigkaw815
Replied by bigkaw815 on topic Petcock Problem
I had one of the vacuum petcocks on my 79 kz650 and it just failed on me one day. I installed the rebuild kit with no help at all. Then, I got a 77-78 gravity petcock off ebay on which the handle broke nearly immediately. I am now running it with a manual on-off gas valve I got for 9 bucks.
Your problems are either A) The o-ring in the end of the gas plug has attached itself inside the hole which it supposed to plug and will not move. b) You have the vacuum line to the petcock attached to the wrong outlet of your carbs. C) Your vacuum diaphragm has torn and therefore will not move the plunger when vacuum is applied D) Vacuum line is obstructed somehow.
All these problems can be solved by A) Doing the right thing and buying a Pingel petcock and adapter plate b) Doing what I did- install a simple on-off gas valve in your gas line and turn your petcock to prime. It works, but is slightly ghetto.
Hope this helps.
Your problems are either A) The o-ring in the end of the gas plug has attached itself inside the hole which it supposed to plug and will not move. b) You have the vacuum line to the petcock attached to the wrong outlet of your carbs. C) Your vacuum diaphragm has torn and therefore will not move the plunger when vacuum is applied D) Vacuum line is obstructed somehow.
All these problems can be solved by A) Doing the right thing and buying a Pingel petcock and adapter plate b) Doing what I did- install a simple on-off gas valve in your gas line and turn your petcock to prime. It works, but is slightly ghetto.
Hope this helps.
Last edit: 18 May 2009 12:12 by bigkaw815.
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- bountyhunter
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18 May 2009 14:29 #292457
by bountyhunter
1979 KZ-750 Twin
Replied by bountyhunter on topic Petcock Problem
mseems wrote:
That's exactly how mine works.:laugh:The only way gas flows is by putting it to the On setting so it flows constantly then I have to remember to shut it off when I stop.
1979 KZ-750 Twin
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