petcock - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 19 (permalink) Old 07-02-2008, 08:38 PM Thread Starter
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petcock

is it better to turn the gas off when not riding or is it ok to just leave it on all the time? I bought mine from my sister and her boyfriend who is a seasoned rider says there is no need to turn the gas off. does this sound right?

1986 vn 750 aka "Huck Farley"
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post #2 of 19 (permalink) Old 07-02-2008, 08:52 PM
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Yes. Our bikes have vacuum operated petcocks, so when there's no engine turning, there's no fuel flow. Unless your sister changed it from a vacuum to a gravity feed, you're ok. (see my new thread, however...)

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post #3 of 19 (permalink) Old 07-02-2008, 08:58 PM
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I always turn my petcock off when I park my baby, because if someone were to steal her by forcing the ignition on, they wouldn't get very far. I doubt the person stealing my bike would know about the petcock. And I don't think it can hurt to turn it off. Just remember to turn it on BEFORE you start it up, or you may forget and start running out of gas very shortly!
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post #4 of 19 (permalink) Old 07-02-2008, 09:32 PM
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Anyone smart enough to be able to steal the bike will know about petcocks.

Jim W
93 VN 750 "Ursula"
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post #5 of 19 (permalink) Old 07-02-2008, 10:04 PM
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Quote:
Originally Posted by Sky Rider View Post
Anyone smart enough to be able to steal the bike will know about petcocks.
Possibly, but not where I'm from (Miami/Ft. Lauderdale). It's mostly kids who steal cycles and cars here. They're smart enough to break in and start cars, but they make stupid mistakes and get caught a lot because of them. They're often high and don't think straight either!

Last edited by rubyrick; 07-02-2008 at 10:17 PM. Reason: corrected a spelling error
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post #6 of 19 (permalink) Old 07-02-2008, 10:06 PM
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True that. Too bad the kids and others think it's OK to take someone elses stuff. Damn drugs.

Jim W
93 VN 750 "Ursula"
Moved R/R 08Sep06
R/R rewire 17Feb07
New R/R, Installed 14Jun08
New Stator installed 10 Jun08
Maintenance Free Battery 12Jan08
21480 Miles
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post #7 of 19 (permalink) Old 07-02-2008, 10:53 PM
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On the vacuum petcocks you can't turn off the gas. It does no good to turn the lever. Remember that the only positions on the petcock are Prime- On- Reserve. When you turn the lever you are putting it to reserve or prime.
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post #8 of 19 (permalink) Old 07-02-2008, 11:01 PM
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I must have a gravity feed then. My 3 positions on the petcock are OFF, ON, RESERVE. By the way, does anyone know exactly how the reserve works, like how is the gas separated in the tank, and how does the valve select from ON to RESERVE? I always like to add to my knowledge base.
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post #9 of 19 (permalink) Old 07-02-2008, 11:42 PM
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Quote:
Originally Posted by tprender View Post
On the vacuum petcocks you can't turn off the gas. It does no good to turn the lever. Remember that the only positions on the petcock are Prime- On- Reserve. When you turn the lever you are putting it to reserve or prime.
From 85 - 91 (I think thats the ending year) had res-on-prime after 91 they dropped the prime and went to Off.


rubyrick, Only if someone changed your petcock, then you have a vac and not gravity fed.

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Last edited by liljd; 07-02-2008 at 11:46 PM.
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post #10 of 19 (permalink) Old 07-03-2008, 05:11 AM
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I don't ever close mine, not on this bike or my last 3. The couple times I did for some reason, I always forgot to turn back on and then was reminded as I was blasting down the road....

And the reserve in the tank is just a small tube sticking up from the valve...
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