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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 21st May 2013
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Default Vacume Petcock Question

If I remove the hose from the vacume inlet of my petcock and hook up a Mityvac and pump it to create a vacume, should it hold the vacume I created?

When I do it to mine, it will pull a few HG's on the gauge but it quickly bleeds off.
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  #2  
Old 21st May 2013
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Default

According to the test procedure in the '06 manual, it should hold a vacuum... you are supposed to "check for slow leaks"
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Old 21st May 2013
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GMAN !
I dont know how sensitive the VOES is but if its TEE'D to the petcock you have 2 issues.
Just my .02
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Default

IIRC, you can disassemble the petcock & reverse the spring/diaphram assembly, to allow the petcock to flow without vacuum. I don't know whether that will affect the VOES thingy, tho.
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Quote:
Originally Posted by BKB View Post
IIRC, you can disassemble the petcock & reverse the spring/diaphram assembly, to allow the petcock to flow without vacuum. I don't know whether that will affect the VOES thingy, tho.
If you go that route you can cap off the vacume line at the petcock and run a single hose to the voes from the carb or just cap off the T also.
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All great replies and thank you. I think I'll check to see if they make a rebuild kit for the petcock first.

And yes, I agree that if I'm leaking vacume at the petcock it would be affecting my Voes.
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Old 22nd May 2013
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Default

Picked up a new petcock at the dealer today.
The hook up for the vacume line does seal tight on the new one.
Since the original one on my bike leaks air that means that I've been trying to tune the carb with what amounts to a vacume leak.
As Rocketmangb said, the VOES is on the same vacume line, so my VOES would be ineffective in controlling my timing.
Time to drain the tank and change the petcock.
BTW a new factory petcock is only $45.00 and comes with the gasket and new filter.
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Old 22nd May 2013
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Default

Quote:
Originally Posted by Gcram399 View Post
Picked up a new petcock at the dealer today.
The hook up for the vacume line does seal tight on the new one. ...
Is the vacuum hose simply expanded?
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Old 22nd May 2013
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Quote:
Originally Posted by sportsterdoc View Post
Is the vacuum hose simply expanded?
No, sorry I miss worded that. The line fits tight, the diaphram must be torn.
When I tested the diaphram I removed the vacume line from the petcock and hooked up the line from my Mityvac. When I couldn't pull and hold a vacume on the diaphram I determined it to be bad.
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Keep the screws from the old petcock. You may need them one day. I had 3 out of 4 of my screws come out on the way home from laconia one year. Was driving down the highway and all of a sudden felt my knee getting wet. I put my hand in the liquid and smelled it and realized it was gas pouring out of the left side of my tank and i have side mounted coils as well. Thank god nothing went bad. I pulled over and realized my petcock was leaking gas. I put a small ziptie in each hole and that held it together u til i got home and bought a new one. My indy told me i was the first person he has heard that happen to.
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