Vacuume switch under fuel tank

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Vacuume switch under fuel tank

31 Mar 2014 17:46
#627289
I have a 1982 kz750 spectre and there is a vacuum activated switch under the fuel tank. Can anyone tell me what this is and can I get rid of it. Thank you
1982 kz750 spectre

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  • Patton
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Re: Vacuume switch under fuel tank

31 Mar 2014 18:03
#627293
hotdogg wrote: I have a 1982 kz750 spectre and there is a vacuum activated switch under the fuel tank. Can anyone tell me what this is and can I get rid of it. Thank you

Vacuum operated petcock allows fuel flow in ON position or in RES position only when the engine is running, and always allows fuel flow when in PRI position (even when the engine isn't running).

Good Fortune! :)

n
1973 Z1
KZ900 LTD

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Re: Vacuume switch under fuel tank

31 Mar 2014 18:24 - 31 Mar 2014 18:25
#627301
You can install a manual fuel valve, but you have to remember to switch it to OFF whenever the bike is parked... otherwise, you may get some carburetor overflow.

The bolt-hole spacing on your Spectre is probably 34mm. If so, here's a fuel valve topic with some options: KZR topic - Manual fuel valve option
1981 KZ650 Competition Sports and Road
Last edit: 31 Mar 2014 18:25 by martin_csr.

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Re: Vacuume switch under fuel tank

31 Mar 2014 18:39
#627307
That's not what I ment let me explain. On carbs 1 and 4 there is a vacume line coming off each one and the join together at a t. From their the linen goes to this switch bolted to the gram that goes to a big hose that connects to the air cleaner box. I don't know what it is
1982 kz750 spectre

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Re: Vacuume switch under fuel tank

31 Mar 2014 18:39
#627308
That's not what I ment let me explain. On carbs 1 and 4 there is a vacume line coming off each one and the join together at a t. From their the linen goes to this switch bolted to the gram that goes to a big hose that connects to the air cleaner box. I don't know what it is
1982 kz750 spectre

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Re: Vacuume switch under fuel tank

31 Mar 2014 18:41
#627310
Line and frame. Sorry about the spell check. I'm on my phone
1982 kz750 spectre

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Re: Vacuume switch under fuel tank

31 Mar 2014 19:00
#627317
I think the switch in question is the "Valve Assembly, Air Switch" as shown below. Ed

Attachment 00007_2014-03-31.jpg not found

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Re: Vacuume switch under fuel tank

31 Mar 2014 19:02
#627319
The "clean air system" may easily be removed and discarded.



But watch out for a squadron of black helicopters with EPA marshals rappelling down toward you.

Good Fortune! :)
1973 Z1
KZ900 LTD

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Re: Vacuume switch under fuel tank

31 Mar 2014 19:33
#627339
That's it!!! What would the purpose of the valve? Emissions or something?
1982 kz750 spectre

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Re: Vacuume switch under fuel tank

31 Mar 2014 19:37
#627341





Good Fortune! :)
1973 Z1
KZ900 LTD

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Re: Vacuume switch under fuel tank

31 Mar 2014 19:42
#627342
So pluging this will not harm the engine? More heat etc....
1982 kz750 spectre

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Re: Vacuume switch under fuel tank

31 Mar 2014 19:47
#627345
hotdogg wrote: So pluging this will not harm the engine? More heat etc....

No harm.
No extra heat.
No downside (except exhaust emissions).

Removes potential air leak sources.

Good Fortune! :)
1973 Z1
KZ900 LTD
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